exam Maths Puzzle Numerical Ability

Frooz Frozen Yogurt has designe a cylindrical container for a new vanilla yogurt. The container is 20cm high and holds 2L. What is its radius, to the nearest tenth of a centimetre?

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Solve the following problem.
Number problem.
The sum of two numbers is 40. If their difference is 10, find the two numbers.
Please show the equation used.

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JMS
The measure of the supplement of an angle is 20 degrees more than three times the measure of the original angle. Find the measures of the angles.