exam Maths Puzzle Numerical Ability

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?

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exam Other Question
I am trying understand this one problem

x-y when x is twice y and x =12
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3 Write a function for the line, in the form f(x)=mx+b, using the information given below.

A linear function containing the points in the following table

x
3
5

and f(x)
-2
-8