Question 78

A purse has Rs 34.5 in the form of 1-rupee, 50-paise and 10-paise coins in the ratio of 6:9:10. Find the number of 10-paise coins.

Solution

Let say, 1-rupee , 50-paise and 10-paise coins are 6k,9k and 10k.

So, $$6k+0.50\times9k+0.10\times10k\ =\ 34.50\ .$$

or, $$11.50k\ =\ 34.50\ .$$

or, $$k\ =\ \frac{34.50}{11.50}=3.$$

So, there are $$\left(10\times3\right)=30\ $$ number of 10-paise coins.

B is correct choice.

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