exam Maths Puzzle Numerical Ability

I am trying understand this one problem

x-y when x is twice y and x =12
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exam Other Question

Rewrite the equation y = print_coeff(m,1)x print_const(b) as a function of x. I need help please!!! The floor of the bakery is 36 ft by 27 ft. The floor needs to be covered by 3ft by 3ft tiles. How many 3 ft by 3ft tiles do you need to cover the floor with no overlaps?