Ben had 175 persimmons and 70 oranges at first. He used
45 of the persimmons and
47 of the oranges. He then bought some more oranges. In the end,
12 of the fruits he had left were persimmons. How many oranges did he buy?
| |
Persimmons |
Oranges |
Total |
| Before |
175 |
70 |
|
| Change 1 |
- 140 |
- 40 |
|
| After 1 |
35 |
30 |
|
| Change 2 |
|
+ some |
|
| After 2 |
1 u |
1 u |
2 u |
Number of persimmons that Ben used
=
45 x 175
= 140
Number of persimmons that Ben had left
= 175 - 140
= 35
Number of oranges that Ben used
=
47 x 70
= 40
Number of oranges that Ben had left
= 70 - 40
= 30
Fraction of the fruits left that were oranges
= 1 -
12=
12 Number of persimmons left = 1 u = 35
Number of oranges left in the end
= 1 u
= 1 x 35
= 35
Number of oranges that Ben bought
= 35 - 30
= 5
Answer(s): 5
