exam Maths Puzzle Numerical Ability

I need help on solving 3x + 4 = 10

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exam Other Question

A painter can do a given job in 6 hours. Her helper can do the same job in 10 hours. The painter begins the work and after two hours is joined by the helper. In how many hours will they complete the job? Insert grouping symbols (parenthesis) so that the expression evaluates to the given number:

24/3*2+2*5; evaluate to 15