In one Chinese class of 80 students, 0.125 of the boys and
34 of the girls passed the exam. A total of 35 students passed the exam. How many boys failed the Chinese exam?
| |
Boys |
Girls |
Total |
| Passed the test |
1 u |
3 p |
35 |
| Failed the test |
7 u |
1 p |
45 |
| Total |
8 u |
4 p |
80 |
0.125 of the boys =
18 of the boys
Total number of boys = 8 u
Total number of girls = 4 p
1 u + 3 p = 35 --- (1)
7 u + 1 p = 80 - 35
7 u + 1 p = 45 --- (2)
Make u the same.
(1)
x77 u + 21 p = 245 --- (3)
(3) - (2)
21 p - 1 p = 245 - 45
20 p = 200
1 p = 200 ÷ 20 = 10
From (2)
Number of boys who failed
= 45 - 1 p
= 45 - 10
= 35
Answer(s): 35
