Kevin had 13 coins in his pocket all of his quoins are either dimes or quarters when he ended his pockets kevin found that he had $2.05 how many dimes and quarters does he have

Step-by-step explanation:

If all were dimes, the total would be $1.30. It is $0.75 more than that.

Each quarter that replaces a dime adds $0.15 to the total, so there must be ...

  $0.75/$0.15 = 5

quarters.

Kevin has 8 dimes and 5 quarters in change.

Check

8 × 0.10 + 5 × 0.25 = 0.80 + 1.25 = 2.05 . . . .  answer checks OK

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.