exam Maths Puzzle Numerical Ability

the sum of the digits of a two digit number is 12. if the digits are reversed the number is 15 more than twice the orignal number what is the original number? how did you get it?

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exam Other Question

5x+7y=b
mx+y=22

Find the vaule of m and b in the following systems so that the soultion to the system is (-3,4). Find the possible values of a if the points with the given coordinates are the indicated distance apart.

30. (a,5), (-7,3); d=(the square root of)29