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

Help please

1) State the domain of the following:?
a) f(x)=cuberoot (x)-8

b) h(x)=3x^2+5x-3

c) m(x)=5x^2+9

d) l(x)=5x-4

e) g(x)=7x+4x+4
Find the LCM of 35y^2 and 175y^9.