PSLE
Cindy and Vanessa folded paper balls over two days. On Wednesday, Cindy folded 7 paper balls more than Vanessa. On Thursday, Cindy folded another 38 paper balls and Vanessa folded another 17. At the end of the two days, Cindy made ⁵₈ of the total number of balls. What was the number of paper balls that Vanessa folded?

	Cindy	Vanessa	Difference
Before	1 u + 7	1 u	7
Change	+ 38	+ 17
After	1 u + 45	1 u + 17	28
Comparing between Cindy and Vanessa in the end	5 p	3 p	2 p

Difference between the number of paper balls that Cindy and Vanessa folded in the end is repeated.

Difference between the number of paper balls that Cindy and Vanessa folded in the end
= 5 p - 3 p
= 2 p

Difference between the number of paper balls that Cindy and Vanessa folded in the end
= (1 u + 45) - (1 u + 17)
= 1 u + 45 - 1 u - 17
= 45 - 17
= 28

2 p = 28

1 p = 28 ÷ 2 = 14

Number of paper balls that Vanessa folded
= 3 p
= 3 x 14
= 42

Answer(s): 42