exam Maths Puzzle Numerical Ability

The sum of the digits of a two-digit number is 8. If the digits are reversed, the number is increased by 54. Find the original number.

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exam Other Question

Find the missing sides and angles.

side A is 6 meters. Side B is 38 degrees. Side c is 67 degrees. Here is the problem: 5t+6+3(t+2)
I need to find the Communitive, Distributive, Addition, and Identity of this equation.

Here are my answers: (5t+6+3t+6)
Communitive: 5t+3t+6+6
Distributive: 8t+12

Is this correct?