Question

In a jar of marbles, the ratio of green marbles to black marbles is 3:5. If the jar contains 21 green marbles, how many black marbles are in the jar?

green 3 21
black 5 ?




Your answer:

10


12


30


35

Answer 1

there are 35 black marbles in the jar

Explanation:

3*7=21

so..

5*7=35