Question 106135
Let x=amount that Brian earns as a tutor---weekly wages
Then (x/2)=amount that Brian earns pumping gas
So x+(x/2)= Brian's total weekly wages
And (x/4)=amount that Brian's sister earns

Now we are told that:

x+(x/2)=(x/4)+150  multiply both sides by 4

4x+2x=x+600  subtract x from both sides

4x+2x-x=x-x+600  collect like terms

5x=600  divide both sides by 5

x=$120------Brian's weekly wages as a tutor
(x/2)=(120/2)=$60-------------------Brian's weekly wages pumping gas

(x/4)=(200/4)=$50 ----------- Brian's sister's weekly wages

CK

$120+$60=$30+$150

$180=$180

Hope this helps---ptaylor