Warren had 70% fewer mini cupcakes than John. After John gave 378 mini cupcakes to Warren, Warren had ³₄ as many mini cupcakes as John. How many mini cupcakes did each of them have in the end?

1. John
2. Warren

	Warren	John	Total
Before	3x7 = 21 u	10x7 = 70 u	13x7 = 91 u
Change	+ 378	- 378
After	3x13 = 39 u	4x13 =  52 u	7x13 = 91 u

Number of mini cupcakes that Warren had at first in percentage
= 100% - 70%
= 30%

30% = ³⁰₁₀₀ = ³₁₀

The total number of mini cupcakes at first and in the end remains unchanged. Make the total number of mini cupcakes the same. LCM of 7 and 13 is 91.

Number of mini cupcakes that John gave to Warren
= 70 u - 52 u
= 18 u

18 u = 378

1 u = 378 ÷ 18 = 21

Number of mini cupcakes that Warren had in the end
= 39 u
= 39 x 21
= 819

Number of mini cupcakes that John had in the end
= 52 u
= 52 x 21
= 1092

Answer(s): (a) 819; (b) 1092