There are some students in the stadium.
310 of them are boys, of whom 20% of them do not wear watches.
57 of the girls do not wear watches. What is the percentage of the students in the stadium who wear watches?
| Boys |
Girls |
Total |
3x5 =
15 u |
7x5 =
35 u |
10x5 =
50 u |
| No watches |
Watches |
No watches |
Watches |
|
| 1x3 |
4x3 |
5x5 |
2x5 |
|
| 3 u |
12 u |
25 u |
10 u |
50 u |
20% =
20100=
15 The number of boys is the repeated identity. Make the number of boys the same. LCM of 3 and 5 is 15.
Number of students who wear watches
= 12 u + 10 u
= 22 u
Total number of students
= 3 u + 12 u + 25 u + 10 u
= 50 u
Percentage of the students in the stadium who wear watches
=
2250 x 100%
= 44%
Answer(s): 44%
