In one History class of 114 pupils, 0.25 of the girls and
23 of the boys passed the test. A total of 56 pupils passed the test. How many girls failed the History test?
| |
Girls |
Boys |
Total |
| Passed the test |
1 u |
2 p |
56 |
| Failed the test |
3 u |
1 p |
58 |
| Total |
4 u |
3 p |
114 |
0.25 of the girls =
14 of the girls
Total number of girls = 4 u
Total number of boys = 3 p
1 u + 2 p = 56 --- (1)
3 u + 1 p = 114 - 56
3 u + 1 p = 58 --- (2)
Make u the same.
(1)
x33 u + 6 p = 168 --- (3)
(3) - (2)
6 p - 1 p = 168 - 58
5 p = 110
1 p = 110 ÷ 5 = 22
From (2)
Number of girls who failed
= 58 - 1 p
= 58 - 22
= 36
Answer(s): 36
