A fruit stall had 5 times as many grapefruits as pears. After 20 pears were added, the number of grapefruits became thrice the number of the pears. How many pears were there at the fruit stall at first?
| |
Grapefruits |
Pears |
| Before |
5x3 =
15 u |
1x3 =
3 u |
| Change |
|
+ 20 |
| After |
3x5 =
15 u |
1x5 =
5 u |
The number of grapefruits remains unchanged. Make the number of grapefruits the same. LCM of 3 and 5 is 15.
Number of pears added
= 5 u - 3 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of pears at the fruit stall at first
= 3 u
= 3 x 10
= 30
Answer(s): 30
