Question

A box contains 35 coins either nickels or dimes all worth $2.90. How many dimes are in the box?

Answer 1

There are 23 dimes in the box

Explanation:

Let nickels=n

Let dimes=(35-n)

Equation: 0.05n+0.10(35-n)=2.90

Multiply both sides by 100: 5n+10(35-n)=290

-5n+350=290

-5n=-60

n=12

35-12=23

Therefore, there are 23 dimes in the box