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?
Answers
Answer:
price of single math book = 825/15=55
so single math book = rs 55
he bought 3 math book so 3×55=165
price of single science book = 855/19=45
so single math book= rs 45
he bought 2 science book so 2×45=90
so all together he need to pay= rs 165+ rs 90
= rs 255
Given that:
The price of 15 maths books is $825.
And the price of 19 science books is $855.
Jack buys 3 maths books and 2 science books.
To Find:
How much he has to pay?
Let us assume:
The price of one maths book be x.
And the price of one science book be y.
According to the question,
↠ 15x = 825
↠ x = 825/15
↠ x = 55
And,
↠ 19y = 855
↠ y = 855/19
↠ y = 45
Finding the total cost:
Cost of 3 maths books + Cost of 2 science books
= 3x + 2y
= 3(55) + 2(45)
= 165 + 90
= 255
Hence,
He has to pay $255.