exam Maths Puzzle Numerical Ability

Solve using the addition principle

x+1/13=9/13

(the 1/13 and 9/13 are fractions)

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exam Other Question

The units digit of a two digit number is 1 less than 3 times the tens digit. If the digits are reversed, the new number is 45 more than the original number. Find the number. Please solve.
(t-1)^2=7