Question

Four pens cost $2 work out the cost of :
A) 1 pen
B) 3 pens
C) 10 pens

The cost of two cups is $3. Work out the cost of :

A) 1 cup of coffee
B) 5 cups of coffee
C) 7 cups of coffee

Answer 1

A) 1 pen=$2/4=0.5$

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Answer 2

Answer:

The cost of four pens cost $2 then cost of 1 pen is 2/4 = $ 0.5

A) 1 Pen = $ 0.5

B) 3 Pens = 3 * 0.5 = $ 1.5

C) 10 Pens = 10 * 0.5 = $ 5

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The cost of two cups is $3 then cost of 1 cup is 3/2 = $ 1.5

A) 1 Cup = $ 1.5

B) 5 Cups = 5 * 1.5 = $ 7.5

C) 7 Cups = 7 * 1.5 = $ 10.5

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By using method of cross multiplication:

1)        4 pens        =         $2

          1 pen          =           X

  4X = 2*1

  X = 2/4 = 0.5

2)        2 cups        =         $3

           1 cup          =         X

       2X = 3*1

        X = 3/2 = 1.5