Container G contains 5 brown marbles and 11 silver marbles. Container H contains 103 brown marbles and 45 silver marbles. How many silver marbles and brown marbles must be moved from Container H to put into Container G so that 50% of the marbles in Container A are brown and 70% of the marbles in Container H are brown?

	Container G		Container H
	Brown marbles	Silver marbles	Brown marbles	Silver marbles
Before	5	11	103	45
Change	+ ?	+ ?	- ?	- ?
After	1 u	1 u	7 p	3 p

50% = ⁵⁰₁₀₀ = 12

70% = ⁷⁰₁₀₀ = 710

Number of brown marbles = 5 + 103 = 108 

Number of silver marbles = 11 + 45 = 56 

1 u + 7 p = 108 --- (1)

1 u + 3 p = 56 ---(2)

(1) - (2)
(1 u + 7 p) - (1 u + 3 p) = 108 - 56
7 p - 3 p = 52
4 p = 52

1 p = 52 ÷ 4 = 13

From (2):
1 u + 3 p = 56
1 u + 3 x 13 = 56
1 u + 39 = 56

1 u = 56 - 39 = 17

Number of silver marbles to be moved from Container H to Container G
= 45 - 3 p
= 45 - 3 x 13
= 45 - 39
= 6

Number of brown marbles to be moved from Container H to Container G
= 1 u - 5
= 17 - 5
= 12

Total number of silver and brown marbles to be moved from Container H to Container G
= 6 + 12
= 18

Answer(s): 18