book Maths Puzzle Numerical Ability

a two digit number is 6 times the sum of its digits. the tens digit is 1 more than the units digit. find the number.

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book Other Question

how do you solve this problem:
y=2x-8
x=y+4

this problem is making me go mad!!!!
HELP ME PLEASE!!!!!!!!!! please solve this equation: I = prt , solve for p