book Maths Puzzle Numerical Ability

please help me with this problem:Expres .15(with the bar at the top of 15)as a fraction in simplest form.

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book Other Question

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 a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a? please show me the work so i can understand how to do it myself