SOLUTION: i have ten coins made up of 5-peso and 10-peso coins.if these ten coins are worth 70 pesos, how many more 5-peso coins than 10-peso coins do i have?

Question 1126969: i have ten coins made up of 5-peso and 10-peso coins.if these ten coins are worth 70 pesos, how many more 5-peso coins than 10-peso coins do i have?
Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!

Let:
F = number of five peso coins
T = number of ten peso coins

(1) F + T = 10 (from "I have ten coins�")
(2) 5F + 10T = 70 (from "�these ten coins are worth 70�")

5*(1) ==> 5F + 5T = 50
Subtract this from (2):
0*F + 5T = 20 �> T=4 �> F=6 �> F-T =

�
Ans: You have two more five peso coins (6) than ten peso coins (4).
�

Check: 4*10 + 6*5 = 40 + 30 = 70 (ok)

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