25 of the people are adults.
910 of the remainder are girls.
There are 21 more girls than adults.
How many people are there?
Adults |
Children |
2 x 10 |
3 x 10 |
|
Girls |
Boys |
|
9 x 3 |
1 x 3 |
20 u |
27 u |
3 u |
The number of children is the combined repeated identity.
Make the number of children the same by using LCM of 3 and 10.
LCM of 3 and 10 = 30
Number of girls = 27 u
Number of adults = 20 u
Number of more girls than adults
= 27 u - 20 u
= 7 u
7 u = 21
1 u = 21 ÷ 7 = 3
Total number of people
= 20 u + 27 u + 3 u
= 50 u
= 50 x 3
= 150
Answer(s): 150