book Maths Puzzle Numerical Ability

1.The area of a rectangle is 60 square meters, and the width is 6 meters. find the length.

2.The length of a rectangle is 15 centimeters, and the perimeter is 50 centimeters.Find the width.

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Hi i'd really appreciate it if someone could help me with this word problem.
A full tank contains 729 litres of pure acid. First m litres of acid was poured out and the tank was f Could you show me how to find the solution to this equation:

A=p=prt when solving for t.

I do not understand how to solve the equation. If you could show me how, I would be