Question

Question #78df6

Answer 1

300 balls in total.
40% yellow:
10% = 30 balls,

`rarr` 40% = 4x30 = 120 yellow balls.

`rarr` 300 - 120 = 180 white balls.

Found:
20% yellow balls:
10% of 120 = 12, `rarr` 20% = 2x 12 = 24 Yellow balls;

80% white balls:
10% of 180 = 18, `rarr` 80% = 8 x 18 = 80 + 64 = 144 White balls.

`rarr` Total amount found: 144 + 24 = 168 nalls in total