Tina, Dawn & Harry have $175 together. Tina has 3x as much as Dawn. Dawn has 2x as much money as Harry. How much money does each have?
So we know that
Subbing (3) into (2), we can see that
Now substitute (4) and (3) into (1) to get
(Note that when we go to check our answer, we have due to rounding errors.)
Does this make sense?
Are you sure you have copied the problem exactly? Although I can solve this, the end result does not divide evenly. If they had 175.50 together, then each would have an evenly dividable amount.
But, going with what you wrote:
Let x = Harry's money
2x = Dawn's money (since Dawn has 2 times as much money as Harry)
3(2x) = Tina's money (Tina has 3 times as much as Dawn)
All together they have $175.
x + 2x + 3(2x) = 175
Collect like terms on the LHS, then divide both sides by the coefficient of x. That will solve for x, which is Harry's money. Then multiply x by the right amounts to calculate Dawn and Tina's money.