SOLUTION: a woman is now 4 times older than her daughter. Six years ago the product of their age was 136. whats their present age

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Question 946121: a woman is now 4 times older than her daughter. Six years ago the product of their age was 136. whats their present age
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
W=4D
Six years ago,
%28W-6%29%28D-6%29=136
Substituting,
%284D-6%29%28D-6%29=136
4D%5E2-30D%2B36=136
4D%5E2-30D-100=0
2D%5E2-15D-50=0
%28D-10%29%282D%2B5%29=0
Only the positive solution makes sense.
D-10=0
D=10
So then,
W=4%2810%29
W=40