book Maths Puzzle Numerical Ability

Rearrange the following so that the letter becomes the subject

p = n(q-2)^2; q =

Can you please show your working out, and thank you in advance

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book Other Question

I have a 20 m x 40 x area. I want to fill it with sand to the depth of 3 inches. How many tonnes of sand will I require? Need help with the following:

Solve the inequality |3x - 1| < 7 and write the answer in the set notation.