exam Maths Puzzle Numerical Ability

4x+6y=15
-x+2y=5

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exam Other Question

Find the Integers that fit the following conditions:
They are between 44 and 53
The sums of their digits are prime
They have more than three factors Hi Can I have some help with the following problem?

The power P that can be obtained from a windmill is directly proportional to the cube of the wind speed s.
(a) Write an equa