exam Maths Puzzle Numerical Ability

I need to write in simplest form

3 5/12 - 1 7/12 =

THanks

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exam Other Question

please expand

X x (X+gs-g)+(s-1) This is a special cubic volume formula

=ROUND(((0.005454*(L+IF(L>=17,1,0.67)))*(((D+0.7)^2+(B+0.7)^2+(D+0.7)*(B+0.7))/3)),0)=V

Using real numbers

=ROUND(((0.005454*(40+IF(