# 64 coins. there were 20 cent coins and 50 cent coins. total is 18.50. how many 20 cent coins and 50 cent coins are there?

1
by Boyet11

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by Boyet11

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y= no. of coins for .50

x + y =64 coins; x=64-y..........1

.2 (x) + .5 (y)=18.50;

.2x +.5y =18.50........................2.

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.2(64-y) +.5y =18.50;

12.8-.2y +.5y =18.50

12.8 +.3y = 18.50;

.3y=18.5-12.8;

.3y=5.7;

y=19.....ans (19 pcs of 50cents)

x=64-19;

x=45.....ans ( 45 pcs of 20 cents)

checking..

.2(45) + .5 (19)= 18.50

9 + 9.5 = 18.50

18.50=18.50