In one Chinese class of 82 pupils, 0.125 of the girls and
45 of the boys passed the mock exam. A total of 44 pupils passed the mock exam. How many girls failed the Chinese mock exam?
| |
Girls |
Boys |
Total |
| Passed the test |
1 u |
4 p |
44 |
| Failed the test |
7 u |
1 p |
38 |
| Total |
8 u |
5 p |
82 |
0.125 of the girls =
18 of the girls
Total number of girls = 8 u
Total number of boys = 5 p
1 u + 4 p = 44 --- (1)
7 u + 1 p = 82 - 44
7 u + 1 p = 38 --- (2)
Make u the same.
(1)
x77 u + 28 p = 308 --- (3)
(3) - (2)
28 p - 1 p = 308 - 38
27 p = 270
1 p = 270 ÷ 27 = 10
From (2)
Number of girls who failed
= 38 - 1 p
= 38 - 10
= 28
Answer(s): 28
