exam Maths Puzzle Numerical Ability

I need to know how to subtract fractions of a number.
My problem is 15 - 2/3.

Thanks

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exam Other Question

I totally 4 got how 2 do this.....

Simplify

10y to the -3rd power times 3y to the 2nd power Hello,

How do i solve this equation:

2^x = 64

thank you.