30 marbles in a bag. 10% of them were blue and 60% of them were red. The rest are yellow. How many of the marbles are yellow?

Step-by-step explanation:

Ok, so we know that there are 30 marbles

to find the amount of blue marbles we need to find 10percent of 30

10percent of 30 = 30/10=3

3blue mables

60percent of 30=18

18red marbles

18+3=21

30-21=9 yellow marbles