Perry had 336 more pens than David at first. Then Perry bought 60 more pens. In the end, Perry has 4 times as many pens as David.
- How many pens did David have?
- Find the total number of pens Perry and David had in the end?
| |
Perry |
David |
Total |
| Before |
1 u + 336 |
1 u |
|
| Change |
+ 60 |
|
|
| After |
1 u + 336 + 60 |
1 u |
5 u |
(a)
Before
Number of pens that Perry had = 1 u + 336
Number of pens that David had = 1 u
After
Number of pens that Perry had = 1 u + 336 + 60 = 4 u
Number of pens that David had = 1 u
1 u + 336 + 60 = 4u
1 u + 396 = 4 u
4 u - 1 u = 396
3 u = 396
1 u = 396 ÷ 3 = 132
(a)
Number of pens that David had
= 1 u
= 132
(b)
Number of pens that Perry and David had in the end
= 4 u + 1 u
= 5 u
= 5 x 132
= 660
Answer(s): (a) 132; (b) 660
