Question

if 15 books cost rupees70 the the cost of 12 books will be ​

Answer 1

15 books cost Rs. 70

Therefore, the cost of 12 books

= Rs. 70/15 X 12

= Rs. 56

The answer will be Rs. 56.

Answer 2

Given :-

• The Cost of 15 books is Rs, 70

To Find :-

• The cost of 12 books

Solution :-

⇒ Cost of 15 books = 70

⇒ Cost of 1 book = 70/15

⇒ Cost of 1 book = 4.66

⇒ Cost of 12 book = Cost of 1 book × 12

⇒ Cost of 12 book = 4.66 × 12

⇒ Cost of 12 book = Rs, 56

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Therefore, Cost of 12 books is Rs,56

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More About Concept :-

• Direct Variation = If two quantities are linked in such a way that an increase in one quantity leads to a corresponding increase in the other and vice versa, then such a variation is called the direct variation. If two quantities are in direct variation, then we also say that they are proportional to each other.
• Inverse Variation = If two quantities are linked in such a way that an increase in one quantity causes a corresponding decrease in the other and vice versa, then such a variation is called an inverse variation. If two quantities are in inverse variation, then we also say that they are inversely proportional to each other.

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