There are some pupils in the zoo.
110 of them are girls, of whom 70% of them do not wear watches.
59 of the boys do not wear watches. What is the percentage of the pupils in the zoo who do not wear watches?
Girls |
Boys |
Total |
1x10 = 10 u |
9x10 = 90 u |
10x10 = 100 u |
No watches |
Watches |
No watches |
Watches |
|
7x1 |
3x1 |
5x10 |
4x10 |
|
7 u |
3 u |
50 u |
40 u |
100 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 do not wear watches
= 7 u + 50 u
= 57 u
Total number of pupils
= 7 u + 3 u + 50 u + 40 u
= 100 u
Percentage of the pupils in the zoo who do not wear watches
=
57100 x 100%
= 57%
Answer(s): 57%