During a donation drive, $2200 was collected by 60 students. Each boy donated $50 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 50 =
$3000 |
0 |
0
|
$3000 |
59
|
59 x 50 =
$2950 |
1 |
1 x 10 =
$10 |
$2960 |
40
|
40 x 50 =
$2000 |
20
|
20 x 10 =
$200 |
$2200
|
Total amount collected if all the donations were made by boys
= 60 x 50
= $3000
Big difference in the total amounts made between the boys and the girls
= 3000 - 2200
= $800
Small difference in the amount made between one boy and one girl
= 50 - 10
= $40
Number of girls
= 800 ÷ 40
= 20
Number of boys
= 60 - 20
= 40
Answer(s): 40
