Glen had 150 starfruits and 70 mangosteens at first. He used
35 of the starfruits and
57 of the mangosteens. He then bought some more mangosteens. In the end,
13 of the fruits he had left were starfruits. How many mangosteens did he buy?
| |
Starfruits |
Mangosteens |
Total |
| Before |
150 |
70 |
|
| Change 1 |
- 90 |
- 50 |
|
| After 1 |
60 |
20 |
|
| Change 2 |
|
+ some |
|
| After 2 |
1 u |
2 u |
3 u |
Number of starfruits that Glen used
=
35 x 150
= 90
Number of starfruits that Glen had left
= 150 - 90
= 60
Number of mangosteens that Glen used
=
57 x 70
= 50
Number of mangosteens that Glen had left
= 70 - 50
= 20
Fraction of the fruits left that were mangosteens
= 1 -
13=
23 Number of starfruits left = 1 u = 60
Number of mangosteens left in the end
= 2 u
= 2 x 60
= 120
Number of mangosteens that Glen bought
= 120 - 20
= 100
Answer(s): 100
