Asked by william pacana

the total amount in pesos of 30 coins consisting of 5-peso coin and 10-peso coin is php 215 . how many coins of each type are there?
Answered by oobleck
if there were x 5-peso coins, then the rest (30-x) are 10-pesos. Adding up the value, you get
5x + 10(30-x) = 215
now solve for x
Answered by John fernan
5x+10(30-x)=215
5x+300-10x =215
5x-10x=215-300
-5x/5 = -85/5
x= 17
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