Mark and Justin have a total of 60 erasers. If Mark gives Justin 33 erasers, Justin will have 4 times as many erasers as him. Find
(a) Mark's erasers
(b) Justin's erasers
|
Mark |
Justin |
Total |
Before |
1 u + 33 |
4 u - 33 |
60 |
Change |
- 33 |
+ 33 |
|
After |
1 u |
4 u |
5 u |
(a)
Total number of erasers
= 1 u + 4 u
= 5 u
5 u = 60
1 u = 60 ÷ 5 = 12
Number of erasers that Mark has
= 1 u + 33
= 12 + 33
= 45
(b)
Number of erasers that Justin has
= 60 - 45
= 15
Answer(s): (a) 45; (b) 15