Book Maths Puzzle Algebra

The tens digit of a two-digit number is 3 more than the units digit. The number is 8 more than 6 times the sum of the digits. Find the number.

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Book Other Question

Troy is 8 years older than skip. In 3 years Troy will be twice as old as skip. How old is Troy now? I need to find the value of w. The formula is 3 x(times) w/2 + 6 = w/5 + 0.1. If you could help me out with this I would appreciate it.
Thanks, Brenda