exam Maths Puzzle Numerical Ability

A painter works on a job for 10 days and is then joined by her helper. Together they finish the job in 6 more days. Her helper could have done the job alone in 30 days. How long would it have taken the painter to do the job alone?

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exam Other Question

Hello,

What is the quotient of:

36x^7 / (3x^3)

thank you.
x^2-4x+2 = 0
5x^2 - 2 = 2x
3x^2 - 6x = 2