If I had three times as many marbles as my friend and toghter we had 48 marbles how many marbles do I have?

48/3=16?

2 answers

Nope.

x + 3x = 48

Solve for x.
Let your friends marbles = x
Your marbles plus theirs is equal to 48.
You have three times as many marbles as her... 3x.
48=3x+x
factor
48=x(3+1)
48=4x
x=12
your friend has 12 marbles and you have 12*3 marbles or 36.