In one Science class of 88 pupils, 0.25 of the girls and
78 of the boys passed the test. A total of 47 pupils passed the test. How many girls failed the Science test?
| |
Girls |
Boys |
Total |
| Passed the test |
1 u |
7 p |
47 |
| Failed the test |
3 u |
1 p |
41 |
| Total |
4 u |
8 p |
88 |
0.25 of the girls =
14 of the girls
Total number of girls = 4 u
Total number of boys = 8 p
1 u + 7 p = 47 --- (1)
3 u + 1 p = 88 - 47
3 u + 1 p = 41 --- (2)
Make u the same.
(1)
x33 u + 21 p = 141 --- (3)
(3) - (2)
21 p - 1 p = 141 - 41
20 p = 100
1 p = 100 ÷ 20 = 5
From (2)
Number of girls who failed
= 41 - 1 p
= 41 - 5
= 36
Answer(s): 36
