Tim has some marbles sue has twice as many mables as tum jim has has 15 mables tim and sue and jim have toatl of 63 marbles hao many marbles does tim have ? ?

Hi!

Let's write this as an equation.

t = Tim
s = Sue
j = Jim

2t = s
j = 15
t + s + j = 63
Put the value of j into the equation.
t + s + 15 = 63
Subtract 15 from both sides
t + s + 15 - 15 = 63 - 15
t + s = 48
Put the value of s into the equation.
t + 2t = 48
3t = 48
Divide by 3 on both sides
3t/3 = 48/3
t = 16
Put the value of t into the equation.
16 + s = 48
Subtract 16 from both sides
16 - 16 + s = 48 - 16
s = 32

Sue has 32 marbles.
Jim has 15.
Tim has 16.

We can check this by matching it with the given information. 

Does Sue have 2 times as many marbles as Tim? 
16 x 2 = 32
Yes!

Do Tim, Sue, and Jim's marbles add up to 63?
16 + 32 + 15 = 63
Yes!

So the answer is Tim has 16 marbles.

Hope this helps! :)