Question

Bob has 20 coins totaling $1.40. If he has only dimes and nickels, how many of each coin does he have?

Answer 1

Bob has `8` dimes and `12` nickels coin.

Explanation:

Dime value ; `10` cents
Nickel value ; `5` cents
`$1.40 =140` cents

Let Bob has `x` number of dimes.
Then, he has `20-x` number of nickels.

By given condition `x*10+(20-x)*5 =140 or 5x= 140-100 or x=40/5=8 :. 20-x=20-8=12`

So Bob has `8`dimes and `12` nickels coin. [Ans]