Abi had 85 green marbles and 30 black marbles. Abi gave away 20% of her green marbles and 60% of her black marbles. What percentage of her marbles left was black?
Percentage of green marbles left
= 100% - 20%
= 80%
Number of green marbles left
= 80% x 85
= 80100 x 85
= 68
Percentage of black marbles left
= 100% - 60%
= 40%
Number of black marbles left
= 40% x 30
=
40100 x 30
= 12
Total number of marbles left
= 68 + 12
= 80
Percentage of marbles left that are black
=
1280 x 100%
= 15%
Answer(s): 15%
