Vincent and Flynn had 42 pens together. Vincent had 6 more pens than Flynn. Both of them sold some of their pens. Flynn sold 20% less pens than what Vincent sold. In the end, Flynn had half as many pens left as Vincent. How many pens had Vincent left?
| |
Vincent
(1) |
Flynn
(2) |
Make p the same
(2)x2 = (3) |
Comparing Vincent
and Flynn at first |
6 more |
|
|
| Before |
24 |
18 |
36 |
| Change |
- 5 u |
- 4 u |
- 8 u |
| After |
2 p |
1 p |
2 p |
Number of pens that Flynn had at first
= (42 - 6) ÷ 2
= 36 ÷ 2
= 18
Number of pens that Vincent had at first
= 18 + 6
= 24
Number of pens that Flynn sold in percent
= 100% - 20%
= 80%
80% =
80100 =
45 Make p the same.
(1) = (3)
24 - 5 u = 36 - 8 u
8 u - 5 u = 36 - 24
3 u = 12
1 u = 12 ÷ 3 = 4
Number of pens that Vincent had left
= 24 - 5 u
= 24 - 5 x 4
= 24 - 20
= 4
Answer(s): 4
