exam Maths Puzzle Numerical Ability

can u please solve this for me.
the sum of the digit of a two digit number is 11. when the digit are reversed, the new number is increased by 20 which is twice the original number. find the original number?

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I have to find the solution to the system of equations by the substitution method. Check answers..and place the solution in the form (x,y), (a,b), (p,q), or (s,t).

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Number 6

4x+2y=4
3x+y=4 23 6 less than 5 times a number is subtracted from 3 times the number. if the result is 12, find the number.