Opal, Gem and Sabrina have 84 erasers. Opal has
34 as many erasers as Gem. Sabrina's erasers is
15 of the total number of Opal's and Gem's erasers. How many erasers must Gem give to Sabrina so that both Opal and Sabrina will have the same number of erasers?
Opal |
Gem |
Sabrina |
Total |
5x7 = 35 u |
1x7 = 7 u |
|
3x5 = 15 u |
4x5 = 20 u |
|
|
15 u |
20 u |
7 u |
84 |
Total number of erasers
= 15 u + 20 u + 7 u
= 42 u
42 u = 84
1 u = 84 ÷ 42 = 2
Opal |
Gem |
Sabrina |
Total |
15 u |
20 u |
7 u |
84 |
|
- 8 u |
+ 8 u |
|
15 u |
12 u |
15 u |
84 |
Number of erasers that Gem must give to Sabrina
= 15 u - 7 u
= 8 u
= 8 x 2
= 16
Answer(s): 16