PSLE
Vanessa and Yoko folded paper balls over two days. On Monday, Vanessa folded 9 paper balls more than Yoko. On Tuesday, Vanessa folded another 14 paper balls and Yoko folded another 3. At the end of the two days, Vanessa made ⁷₁₀ of the total number of balls. What was the number of paper balls that Yoko folded?

	Vanessa	Yoko	Difference
Before	1 u + 9	1 u	9
Change	+ 14	+ 3
After	1 u + 23	1 u + 3	20
Comparing between Vanessa and Yoko in the end	7 p	3 p	4 p

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

Difference between the number of paper balls that Vanessa and Yoko folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper balls that Vanessa and Yoko folded in the end
= (1 u + 23) - (1 u + 3)
= 1 u + 23 - 1 u - 3
= 23 - 3
= 20

4 p = 20

1 p = 20 ÷ 4 = 5

Number of paper balls that Yoko folded
= 3 p
= 3 x 5
= 15

Answer(s): 15