During a donation drive, $1550 was collected by 60 students. Each boy donated $30 and each girl donated $20. 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 20 =
$20 |
$1790 |
35
|
35 x 30 =
$1050 |
25
|
25 x 20 =
$500 |
$1550
|
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 - 1550
= $250
Small difference in the amount made between one boy and one girl
= 30 - 20
= $10
Number of girls
= 250 ÷ 10
= 25
Number of boys
= 60 - 25
= 35
Answer(s): 35
