SOLUTION: paul has twice as many dimes as pennies and 3 times as many nickels as pennies. in all he has 1.80? how many coins of each type does he have?

Question 508726: paul has twice as many dimes as pennies and 3 times as many nickels as pennies. in all he has 1.80? how many coins of each type does he have?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of pennies
Let = number of nickels
Let = number of dimes
given:
(1)
(2)
(3) ( in pennies )
Substitute (1) and (2) into (3)
(3)
(3)
(3)
(3)
and
(1)
(1)
and
(2)
(2)
There are 5 pennies, 15 nickels, and 10 dimes
check answer:
(3)
(3)
(3)
(3)
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