Question

Price of 15 maths book is $825 and the price of 19 science book is $855. Jack buys 3 maths book and 2 science book, how much he has to pay?​

Answer 1

your question answer is this

3 maths books = 165

2 science books = 90

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Answer 2

Answer:

Here's your answer.

Step-by-step explanation:

Here we need to use the unitary method.

15 maths book = $825

1 maths book = 825/15

1 maths book = $55

19 Science book = $855

1 Science book = 855/19

1 science book = $45

He wants to buy

3 maths book = ?

1 maths book = $55

3 maths book = 55 x 3

                       = $165

+

2 Science book = ?

1 Science book = $45

2 Science book = 45 x 2

                          = $90

3 maths book + 2 Science book = Total cost

$165                +  $90                   = $255

Hence jack will pay $ 255.

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