exam Maths Puzzle Numerical Ability

Victor earns $3 an hour working after school and $4 an hour working on saturdays. Last week he earned $43, working a total of 13h. How many hours did he work on saturday?

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I think I did this right but want to make sure. im solving for x. 2(x-5)^2=3 I got x=(rad)(3/2) + 5 am i right? The variables r and s represent the lengths of the legs of a right triangle, and t represents the length of the hypotenuse. Find the unknown value. Then tell whether the lengths form a Pythagorean triple.

s=16, t=34