There are some pupils in the zoo.
15 of them are girls, of whom 70% of them do not wear watches.
14 of the boys do not wear watches. What is the percentage of the pupils in the zoo who wear watches?
Girls |
Boys |
Total |
1x10 = 10 u |
4x10 = 40 u |
5x10 = 50 u |
No watches |
Watches |
No watches |
Watches |
|
7x1 |
3x1 |
1x10 |
3x10 |
|
7 u |
3 u |
10 u |
30 u |
50 u |
70% =
70100=
710 The number of girls is the repeated identity. Make the number of girls the same. LCM of 1 and 10 is 10.
Number of pupils who wear watches
= 3 u + 30 u
= 33 u
Total number of pupils
= 7 u + 3 u + 10 u + 30 u
= 50 u
Percentage of the pupils in the zoo who wear watches
=
3350 x 100%
= 66%
Answer(s): 66%