In one Science class of 100 students, 0.25 of the boys and
34 of the girls passed the test. A total of 57 students passed the test. How many boys failed the Science test?
|
Boys |
Girls |
Total |
Passed the test |
1 u |
3 p |
57 |
Failed the test |
3 u |
1 p |
43 |
Total |
4 u |
4 p |
100 |
0.25 of the boys =
14 of the boys
Total number of boys = 4 u
Total number of girls = 4 p
1 u + 3 p = 57 --- (1)
3 u + 1 p = 100 - 57
3 u + 1 p = 43 --- (2)
Make u the same.
(1)
x33 u + 9 p = 171 --- (3)
(3) - (2)
9 p - 1 p = 171 - 43
8 p = 128
1 p = 128 ÷ 8 = 16
From (2)
Number of boys who failed
= 43 - 1 p
= 43 - 16
= 27
Answer(s): 27