Ethan had 60 oranges and 168 starfruits at first. He used
45 of the oranges and
57 of the starfruits. He then bought some more starfruits. In the end,
110 of the fruits he had left were oranges. How many starfruits did he buy?
| |
Oranges |
Starfruits |
Total |
| Before |
60 |
168 |
|
| Change 1 |
- 48 |
- 120 |
|
| After 1 |
12 |
48 |
|
| Change 2 |
|
+ some |
|
| After 2 |
1 u |
9 u |
10 u |
Number of oranges that Ethan used
=
45 x 60
= 48
Number of oranges that Ethan had left
= 60 - 48
= 12
Number of starfruits that Ethan used
=
57 x 168
= 120
Number of starfruits that Ethan had left
= 168 - 120
= 48
Fraction of the fruits left that were starfruits
= 1 -
110=
910 Number of oranges left = 1 u = 12
Number of starfruits left in the end
= 9 u
= 9 x 12
= 108
Number of starfruits that Ethan bought
= 108 - 48
= 60
Answer(s): 60
