Question

A boy has 11 coins in dimes and quarters. Their value is $1.70. How many of each does he have?

Answer 1

Dime = 10 cents
Quarter = 25 cents

$1 = 4 * 25 cents (4 quarters)
70 cents = 7 * 10 cents (7 dimes)

7 dimes + 4 quarters = 11 coins