book Maths Puzzle Numerical Ability

hi
how do you do percentages

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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+ 28. Solve each of the following equations for x

2(x-3)-3 (x+5)= 3 (x-2)-7