There are some pupils in the bird park.
110 of them are girls, of whom 40% of them do not wear watches.
29 of the boys do not wear watches. What is the percentage of the pupils in the bird park who wear watches?
Girls |
Boys |
Total |
1x5 = 5 u |
9x5 = 45 u |
10x5 = 50 u |
No watches |
Watches |
No watches |
Watches |
|
2x1 |
3x1 |
2x5 |
7x5 |
|
2 u |
3 u |
10 u |
35 u |
50 u |
40% =
40100=
25 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 5 is 5.
Number of pupils who wear watches
= 3 u + 35 u
= 38 u
Total number of pupils
= 2 u + 3 u + 10 u + 35 u
= 50 u
Percentage of the pupils in the bird park who wear watches
=
3850 x 100%
= 76%
Answer(s): 76%