Multiply 7 by 7.
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6 lots of 7 buttons is 6 × 7 buttons = 42 buttons.
2 x 7 = 14
if the balls are in the ratio of 7:10, then in every 7+10 = 17 of them 7 are white and 10 are black. With 136 marbles there are 136 ÷ 17 = 8 lots → there are 8 lots × 7 white/lot = 56 white.
17
Multiply by 7 then divide by 100.