a parking meter accepts only 20p coins or 50p coins.On one day, 39 coins were collected with a total value of $11.40. find how many coins were collected.
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a parking meter accepts only 20p coins or 50p coins.On one day, 39 coins were collected with a total value of $11.40. find how many coins were collected.
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Answer:
x+Y=39 or x=39-y
.20x+.50y=11.40
.20(39-y)+.50y=11.40
7.80-.20y+.50y=11.40
.30y=11.40-7.80
.30y=3.60
y=3.60/.30
y=12 50p coins were collected.
x=39-12=27 20p coins were collected.
Proof:
.20*27+.50*12=11.40
5.40+6=11.40
11.40=11.40