book Maths Puzzle Numerical Ability

Please help me solve this equation: w(w-1)/3+1/2=(w+1)/2
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book Other Question

A used car sales persone is paid a commission of $25 plus 40% of the selling price in excess of the owner's cost. The ownner claims that used cars yupically sell for at least owner MY ASSIGNMENT SAID FOR ME TO WRITE AN EXPRESSION FOR EACH QUANITY.
tHE FIRST PROBLEM READS; 1. THE VALUE IN CENTS OF 5 QUARTERS. I BELIEVE THE ANSWER IS THE FOLLOWING. 25+25+25+