book Maths Puzzle Numerical Ability

The sum of the digets of a two digit number is 10. if the digets were reversed, the new number would be 54 less than the original number. find the original number.
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book Other Question

A rectangle has a perimeter of centimeters.The length of the rectangle is 11 centimeters longer than triple the width. Find the dimensions of the rectangle Graph each pair of Equations:

2x+5y=0 2x+ y=8