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 50p coins were collected.
Share
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 50p coins were collected.
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Verified answer
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
brother I need reason for that not yes or no