Question 536473: Katie has 30 coins. Some are dimes and some are nickels. In all she has $2.10. How many nickels and dimes does she have? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = number of dimes
Let = number of nickels
given:
(1)
(2) ( in cents )
-----------------
Multiply both sides of (1) by
then subtract (1) from (2)
(2)
(1)
and, since
(1)
(1)
(1)
(1)
She has 12 dimes and 18 nickels
check:
(2)
(2)
(2)
OK
