Question

Tim has some marbles.

Sue has twice as many marbles as Tim
Jim has 15 marbles
Tim, Sue and Jim have a total of 63 marbles
How many marbles does Tim have?

Answer 1

2t=s
J=15
T+s+j= 63
63-15=48
T+s=48
T = 16
S= 32

Tim has 16 marbles

Answer 2

Let x = the number of marbles Tim has

Let 2x = the number of marbles Sue has

x + 2x + 15 = 63

3x = 48

x = 16 marbles

Explanation: