exam Maths Puzzle Numerical Ability

Find the solution set for (radical 3x+7)+(radical x+6)=3.

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exam Other Question

Edwin can tune up his chevy in 2 hrs working alone. His sone, Beau, can do the job in 3hr working alone. How long would it take them if they worked together? (let t represent the time working together) I am trying to simplify the following cube root 40 times 4 cuberoot 5
40^1/3 * (4)5^1/3 . I'm not sure if I multiply the 5 *40 and get 4(200^1/3) or can it be simplified more? Tha