Perry and Harry have a total of 90 pens. If Perry gives Harry 42 pens, Harry will have 4 times as many pens as him. Find
(a) Perry's pens
(b) Harry's pens
|
Perry |
Harry |
Total |
Before |
1 u + 42 |
4 u - 42 |
90 |
Change |
- 42 |
+ 42 |
|
After |
1 u |
4 u |
5 u |
(a)
Total number of pens
= 1 u + 4 u
= 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Number of pens that Perry has
= 1 u + 42
= 18 + 42
= 60
(b)
Number of pens that Harry has
= 90 - 60
= 30
Answer(s): (a) 60; (b) 30