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Practice set d

Garden A produces 5.8 times as many vegetables as garden B. Together the gardens produce 102 pounds of vegetables. How many pounds of vegetables does garden A produce?

  1. Let x =

Garden A produces 87 pounds of vegetables.

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Sample set e

Two consecutive even numbers sum to 432. What are the two numbers?

Step 1: Let x = the smaller even number . Then x + 2 = the next (consecutive) even number since consecutive even numbers differ by 2 (as do consecutive odd numbers) .
Step 2: x + x + 2 = 432. Step 3: x + x + 2 = 432 2 x + 2 = 432 2 x = 430 x = 215. Also, since x = 215 , x + 2 = 217.
Step 4 : 215 + 217 = 432 , but 215 and 217 are odd numbers and we are looking for even numbers . Upon checking our method of solution and reexamining our equation , we find no mistakes . Step 5 : We must conclude that this problem has no solution . There are no two consecutive e v e n numbers that sum to 432 .

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Practice set e

The sum of two consecutive even numbers is 498. What are the two numbers?

The two numbers are 248 and 250.

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Exercises

Solve the following problems. Note that some of the problems may seem to have no practical applications and may not seem very interesting. They, along with the other problems, will, however, help to develop your logic and problem-solving ability.

If eighteen is subtracted from some number the result is fifty-two. What is the number?

  1. Let x =
  2. The equation is
  3. (Solve the equation.)
  4. (Check)
  5. The number is .

Step 1: Let x = the unknown quantity.

Step 2: The equation is x 18 = 52.

Step 3: (Solve the equation.) Add 18 to each side.

     x 18 + 18 = 52 + 18

     x = 70

Step 4: (Check) 70 18 = 52 ; True.

Step 5: The number is 70.

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If nine more than twice a number is forty-six, what is the number?

  1. Let x =
  2. The equation is
  3. (Solve the equation.)
  4. (Check)
  5. The number is .

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If nine less than three eighths of a number is two and one fourth, what is the number?

  1. Let x =
  2. The number is .

Step 5: The number is 30.

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Twenty percent of a number is 68. What is the number?

  1. Let x =
  2. The number is .
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Eight more than a quantity is 37. What is the original quantity?

  1. Let x =
  2. The original quantity is .

Step 5: The original quantity is 29.

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If a quantity plus 85 % more of the quantity is 62.9 , what is the original quantity?

  1. Let x = original quantity.
  2. x original quantity + .85 x 85% more = 62.9
  3. The original quantity is .
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A company must increase production by 12 % over last year’s production. The new output will be 56 items. What was last year’s output?

  1. Let P =
  2. Last year’s output was items.

Step 5: Last year's output was 50 items.

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A company has determined that it must increase production of a certain line of goods by 1 1 2 times last year’s production. The new output will be 2885 items. What was last year’s output?

  1. Last year’s output was items.
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A proton is about 1837 times as heavy as an electron. If an electron weighs 2.68 units, how many units does a proton weigh?

  1. A proton weighs units.

Step 5: A proton weighs 4923 .16 units.

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Neptune is about 30 times as far from the sun as is the Earth. If it takes light 8 minutes to travel from the sun to the Earth, how many minutes does it take to travel to Neptune?

  1. Light takes minutes to reach Neptune.
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Questions & Answers

Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
Widad Reply
can you send the book attached ?
Ariel
?
Ariel
What is economics
Widad Reply
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn Reply
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn
what is ecnomics
Jan Reply
this is the study of how the society manages it's scarce resources
Belonwu
what is macroeconomic
John Reply
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
etc
husaini
difference between firm and industry
husaini Reply
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from Qd  120 3P to Qd  90  3P and the supply function has shifted from QS  20  2P to QS 10  2P . a) Find the effect of this change on price and quantity. b) Which of the changes in demand and supply is higher?
Toofiq Reply
explain standard reason why economic is a science
innocent Reply
factors influencing supply
Petrus Reply
what is economic.
Milan Reply
scares means__________________ends resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Zarshad Reply
Why qualify 28 supplies
Milan
what are explicit costs
Nomsa Reply
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
David Reply
economic overview notes
Amahle Reply
identify a demand and a supply curve
Salome Reply
i don't know
Parul
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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Source:  OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
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