exam Maths Puzzle Numerical Ability

The sum of the digits of two- digit numbers is 10. if the digits are reversed, the new number is 54 less than the original number. Find the original number.

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exam Other Question

Help me solve this equation
Alex scored 13 points in the basketball game. This was 1/5 of the total points the team scored. Write and solve an equation to determine the total points the team scored.
How do I write this serie using sigma notation?

1/2 + 2/3 + 3/4 + ... 99/100