In a box, there are lollipops of 3 colours, silver, grey and blue. There are 490 less blue lollipops than grey lollipops. The number of blue lollipops is ¹₅ more than the silver lollipops. Given that the number of blue lollipops is 18% of the total number of lollipops in the box, how many less silver lollipops are there than grey lollipops?

Silver lollipops	Grey lollipops	Blue lollipops
	1 u + 490	1 u
5x3		6x3
82%		18%
15%	67%	18%

1 + ¹₅ = ⁵₅ + ¹₅ = ⁶₅

Yellow lollipops : Purple lollipops = 5 : 6

The number of blue lollipops is repeated.  Make the number of blue lollipops the same.

6 x 3 = 18%

Total number of silver lollipops and grey lollipops in percent
= 100% - 18%
= 82%

Number of grey lollipops in percent
= 82% - 15%
= 67%

Number of more grey lollipops than blue lollipops in percent
= 67% - 15%
= 49%

49% = 490

1% = 490 ÷ 49 = 10

Number of less silver lollipops than grey lollipops
= 67% - 15%
= 52%
= 52 x 10
= 520

Answer(s): 520