In a container, there are chocolate bars of 3 colours, green, grey and brown. There are 603 more grey chocolate bars than brown chocolate bars. The number of brown chocolate bars is ¹₃ more than the green chocolate bars. Given that the number of brown chocolate bars is 12% of the total number of chocolate bars in the container, how many more grey chocolate bars are there than green chocolate bars?

Green chocolate bars	Grey chocolate bars	Brown chocolate bars
	1 u + 603	1 u
3x3		4x3
88%		12%
9%	79%	12%

1 + ¹₃ = ³₃ + ¹₃ = ⁴₃

Yellow chocolate bars : Purple chocolate bars = 3 : 4

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

4 x 3 = 12%

Total number of green chocolate bars and grey chocolate bars in percent
= 100% - 12%
= 88%

Number of grey chocolate bars in percent
= 88% - 9%
= 79%

Number of more grey chocolate bars than brown chocolate bars in percent
= 79% - 9%
= 67%

67% = 603

1% = 603 ÷ 67 = 9

Number of more grey chocolate bars than green chocolate bars
= 79% - 9%
= 70%
= 70 x 9
= 630

Answer(s): 630