Jade and Jane collected postcards. Jade gave 60% of her postcards to Jane and as a result, Jane's postcards increased by 20%. If Jade had 20 postcards left, find the number of postcards Jane should give to Jade in the end so that both had an equal number of postcards.

	Jade	Jane	Comparing the change in Jane's postcards
Before	5x1 = 5 u		5x3 = 15u
Change	- 3x1 = - 3 u	+ 3x1 = + 3 u	+ 1x3 = + 3 u
After	2x1 = 2 u		6x3 = 18 u

60% = ⁶⁰₁₀₀ = ³₅
20% = ²⁰₁₀₀ = ¹₅

The increase in the number of postcards that Jane had is repeated.  Make the increase in the number of postcards that Jane had the same. LCM of 3 and 1 = 3

2 u = 20

1 u = 20 ÷ 2 = 10

Number of postcards that Jane had more than Jade in the end
= 18 u - 2 u
= 16 u

Number of postcards that Jane should give to Jade so that both had an equal number of postcards in the end
= 16 u ÷ 2
= 8 u
= 8 x 10
= 80

Answer(s): 80