In a box, there are sweets of 3 colours, yellow, white and brown. There are 396 less brown sweets than white sweets. The number of brown sweets is ¹₂ more than the yellow sweets. Given that the number of brown sweets is 21% of the total number of sweets in the box, how many less yellow sweets are there than white sweets?

Yellow sweets	White sweets	Brown sweets
	1 u + 396	1 u
2x7		3x7
79%		21%
14%	65%	21%

1 + ¹₂ = ²₂ + ¹₂ = ³₂

Yellow sweets : Purple sweets = 2 : 3

The number of brown sweets is repeated.  Make the number of brown sweets the same.

3 x 7 = 21%

Total number of yellow sweets and white sweets in percent
= 100% - 21%
= 79%

Number of white sweets in percent
= 79% - 14%
= 65%

Number of more white sweets than brown sweets in percent
= 65% - 14%
= 44%

44% = 396

1% = 396 ÷ 44 = 9

Number of less yellow sweets than white sweets
= 65% - 14%
= 51%
= 51 x 9
= 459

Answer(s): 459