PSLE At Jack's fruit stall,
89 of the dragonfruits were red and the rest were white. He sold
13 of the total number of dragonfruits.
45 of the dragonfruits sold were red. 20 white dragonfruits were left. How many white dragonfruits did Jack sell?
|
Red |
White |
Total |
Before |
8x5 = 40 u |
1x5 = 5 u |
9x5 = 45 u |
Change |
|
|
- 3x5 = - 15 u |
Comparing white dragonfruits and red dragonfruits sold |
- 4x3 = - 12 u |
- 1x3 = - 3 u |
- 5x3 = - 15 u |
After |
28 u |
2 u |
6x5 = 30 u |
The total number of dragonfruits is the same. Make the denominators of the total number of dragonfruits the same.
13 =
39The number of dragonfruits sold is the repeated identity. Make the number of dragonfruits sold the same. LCM of 3 and 5 is 15.
2 u = 20
1 u = 20 ÷ 2 = 10
Number of white dragonfruits that Jack sold
= 3 u
= 3 x 10
= 30
Answer(s): 30