During a donation drive, $1340 was collected by 60 pupils. Each boy donated $30 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 30 = $1800 |
0 |
0
|
$1800 |
59
|
59 x 30 = $1770 |
1 |
1 x 10 = $10 |
$1780 |
37
|
37 x 30 = $1110 |
23
|
23 x 10 = $230 |
$1340
|
Total amount collected if all the donations were made by boys
= 60 x 30
= $1800
Big difference in the total amounts made between the boys and the girls
= 1800 - 1340
= $460
Small difference in the amount made between one boy and one girl
= 30 - 10
= $20
Number of girls
= 460 ÷ 20
= 23
Number of boys
= 60 - 23
= 37
Answer(s): 37