Writing an equation and solving a multiplicative comparison word problem

Question

There are 20

 marbles in a blue jar. The blue jar has 4

 times as many marbles as a red jar. Let m

 be the number of marbles in the red jar.

Answer 1

b =4m m=marbles in red jar b=marbles in blue jar

b +m =20 total marbles in both jars

4m+m = 20

5m = 20

m = 20/5 = 4 marbles in the red jar

4x4 = 16 marbles in the blue jar