The number of oranges Tom bought in October was 40% more than in September. In November, he bought 70% less oranges than in October. If there were 261 more oranges in September than November, how many oranges did Tom buy in September?
| September |
October |
November |
| 5x10 |
7x10 |
|
| |
10x7 |
3x7 |
| 50 u |
70 u |
21 u |
100% + 40 = 140%
140% =
140100 =
75October : September = 7 : 5
100% - 70% = 30%
30% =
30100 =
310 November : October = 3 : 10
The number of oranges in October is repeated. Make the number of oranges in October is the same. LCM of 7 and 10 is 70.
Number of more oranges in September than November
= 50 u - 21 u
= 29 u
29 u = 261
1 u = 261 ÷ 29 = 9
Number of oranges that Tom bought in September
= 50 u
= 50 x 9
= 450
Answer(s): 450
