exam Maths Puzzle Numerical Ability

PLease help to simplify by adding like terms :

{a/x - 3a^2*c^0x^-1 / a) + (4x^-1 / aa^-2)

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exam Other Question

This is the addition method, you have to multiply before you add to get the solution set.

I thought that the first problem was set up as 1(x+y)=(48)1 then I got lost???

x+y=48
12x+14y=628 The volume of a cylinder is given by {{{V= (3.14)r^2*h}}} where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 100 cubic cent