exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing..

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exam Other Question

17) The length of a rectangle is 3 cm more than 2 times its width. If the area of the rectangle is 99 cm^2, find the dimensions of the rectangle to the nearest thousandth. 7) Tickets for a play at the community theater cost $20 for an adult and $8 for a child. If 220 tickets were sold and the total receipts were $3200, how many of each type of ticket were sold?

Can someone please help?

v/r
Jess