Cathy had 100 black coins and 50 red coins. Cathy gave away 20% of her black coins and 60% of her red coins. What percentage of her coins left was red?
Percentage of black coins left
= 100% - 20%
= 80%
Number of black coins left
= 80% x 100
= 80100 x 100
= 80
Percentage of red coins left
= 100% - 60%
= 40%
Number of red coins left
= 40% x 50
=
40100 x 50
= 20
Total number of coins left
= 80 + 20
= 100
Percentage of coins left that are red
=
20100 x 100%
= 20%
Answer(s): 20%
