PSLE
Cathy and Olivia folded paper stars over two days. On Thursday, Cathy folded 15 paper stars more than Olivia. On Friday, Cathy folded another 35 paper stars and Olivia folded another 14. At the end of the two days, Cathy made ⁷₁₀ of the total number of stars. What was the number of paper stars that Olivia folded?

	Cathy	Olivia	Difference
Before	1 u + 15	1 u	15
Change	+ 35	+ 14
After	1 u + 50	1 u + 14	36
Comparing between Cathy and Olivia in the end	7 p	3 p	4 p

Difference between the number of paper stars that Cathy and Olivia folded in the end is repeated.

Difference between the number of paper stars that Cathy and Olivia folded in the end
= 7 p - 3 p
= 4 p

Difference between the number of paper stars that Cathy and Olivia folded in the end
= (1 u + 50) - (1 u + 14)
= 1 u + 50 - 1 u - 14
= 50 - 14
= 36

4 p = 36

1 p = 36 ÷ 4 = 9

Number of paper stars that Olivia folded
= 3 p
= 3 x 9
= 27

Answer(s): 27