Bobby and Harry have a total of 84 pens. If Bobby gives Harry 20 pens, Harry will have 5 times as many pens as him. Find
(a) Bobby's pens
(b) Harry's pens
|
Bobby |
Harry |
Total |
Before |
1 u + 20 |
5 u - 20 |
84 |
Change |
- 20 |
+ 20 |
|
After |
1 u |
5 u |
6 u |
(a)
Total number of pens
= 1 u + 5 u
= 6 u
6 u = 84
1 u = 84 ÷ 6 = 14
Number of pens that Bobby has
= 1 u + 20
= 14 + 20
= 34
(b)
Number of pens that Harry has
= 84 - 34
= 50
Answer(s): (a) 34; (b) 50