book Maths Puzzle Numerical Ability

The tens digit of a two digit number is twice the units digit. If the digits are reversed, the new number is 36 less than the original number. Find the number. HELP!

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book Other Question

Solve for t: 2t+7 is greater than t+15 and 5t+6 is greater than or equal to 2t+12 I need help,here's an example:

Rewrite the equation so that y is a function of x.

-4x + y = 9
-3y + 18x = 12

Please keep it simple I'm only 12. Thanks, Tony