In one Chinese class of 80 pupils, 0.125 of the girls and
78 of the boys passed the mock test. A total of 46 pupils passed the mock test. How many girls failed the Chinese mock test?
|
Girls |
Boys |
Total |
Passed the test |
1 u |
7 p |
46 |
Failed the test |
7 u |
1 p |
34 |
Total |
8 u |
8 p |
80 |
0.125 of the girls =
18 of the girls
Total number of girls = 8 u
Total number of boys = 8 p
1 u + 7 p = 46 --- (1)
7 u + 1 p = 80 - 46
7 u + 1 p = 34 --- (2)
Make u the same.
(1)
x77 u + 49 p = 322 --- (3)
(3) - (2)
49 p - 1 p = 322 - 34
48 p = 288
1 p = 288 ÷ 48 = 6
From (2)
Number of girls who failed
= 34 - 1 p
= 34 - 6
= 28
Answer(s): 28