There are 20% as many yellow marbles as silver marbles in Penelope's collection of marbles. The number of brown marbles is 35% fewer than the number of silver marbles. There are 315 more brown marbles than yellow marbles.

1. Find the total number of marbles in the collection.
2. What percentage are the number of silver marbles as compared to the number of brown marbles? Leave your answer as a mixed number in its simplest form.

Yellow	Silver	Brown
1x4	5x4
	20x1	13x1
4 u	20 u	13 u

(a)
20% = ²⁰₁₀₀ = ¹₅

100% - 35% = 65%
65% = ⁶⁵₁₀₀ = ¹³₂₀

The number of silver marbles is the repeated identity. Make the number of silver marbles the same.  LCM of 5 and 20 is 20.

Number of more brown marbles than yellow marbles
= 13 u - 4 u
= 9 u

9 u = 315

1 u = 315 ÷ 9 = 35

Total number of marbles in the collection
= 4 u + 20 u + 13 u 
= 37 u
= 37 x 35
= 1295

(b)
Percentage of the number of silver marbles as compared to the number of brown marbles
= ²⁰₁₃ x 100%
= ²⁰⁰⁰₁₃ %
= 153¹¹₁₃ %

Answer(s): (a) 1295; (b) 153¹¹₁₃ %