book Maths Puzzle Numerical Ability

Solve for t: 2t+7 is greater than t+15 and 5t+6 is greater than or equal to 2t+12

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book Other Question

10/y + 8/ysquared / 5 + 4/y 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!