Jen had 128 pens.
78 of them were pink pens and the rest were white pens. After she had given away some pink pens, the ratio of the number of pink pens to the number of white pens became 3 : 4. How many pens did she have in the end?
| |
Pink |
White |
Total |
| Before |
7x4 =
28 u |
1x4 =
4 u |
8x4 =
32 u |
| Change |
- 25 u |
|
|
| After |
3 u |
4 u |
7 u |
The number of white pens remained unchanged.
LCM of 1 and 4 = 4
Total number of pens at first = 32 u
32 u = 128
1 u = 128 ÷ 32 = 4
Number of pens that Jen had in the end
= 3 u + 4 u
= 7 u
= 7 x 4
= 28
Answer(s):28
