In a container, there are chocolate bars of 3 colours, pink, grey and yellow. There are 30 less yellow chocolate bars than grey chocolate bars. The number of yellow chocolate bars is ¹₅ more than the pink chocolate bars. Given that the number of yellow chocolate bars is 30% of the total number of chocolate bars in the container, how many less pink chocolate bars are there than grey chocolate bars?

Pink chocolate bars	Grey chocolate bars	Yellow chocolate bars
	1 u + 30	1 u
5x5		6x5
70%		30%
25%	45%	30%

1 + ¹₅ = ⁵₅ + ¹₅ = ⁶₅

Yellow chocolate bars : Purple chocolate bars = 5 : 6

The number of yellow chocolate bars is repeated.  Make the number of yellow chocolate bars the same.

6 x 5 = 30%

Total number of pink chocolate bars and grey chocolate bars in percent
= 100% - 30%
= 70%

Number of grey chocolate bars in percent
= 70% - 25%
= 45%

Number of more grey chocolate bars than yellow chocolate bars in percent
= 45% - 25%
= 15%

15% = 30

1% = 30 ÷ 15 = 2

Number of less pink chocolate bars than grey chocolate bars
= 45% - 25%
= 20%
= 20 x 2
= 40

Answer(s): 40