During a donation drive, $960 was collected by 60 students. Each boy donated $20 and each girl donated $10. How many boys were there?
Number of
boys |
Amount collected
by boys |
Number of
girls |
Amount collected
by girls |
Total amount
collected |
60
|
60 x 20 =
$1200 |
0 |
0
|
$1200 |
59
|
59 x 20 =
$1180 |
1 |
1 x 10 =
$10 |
$1190 |
36
|
36 x 20 =
$720 |
24
|
24 x 10 =
$240 |
$960
|
Total amount collected if all the donations were made by boys
= 60 x 20
= $1200
Big difference in the total amounts made between the boys and the girls
= 1200 - 960
= $240
Small difference in the amount made between one boy and one girl
= 20 - 10
= $10
Number of girls
= 240 ÷ 10
= 24
Number of boys
= 60 - 24
= 36
Answer(s): 36
