exam Maths Puzzle Numerical Ability

There are at most 12 bicycles and tricycles in a school playground. There are at least 17 wheels altogether. Write a system of inequalities that describe this situation for x bicyc

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exam Other Question

When the digits of a two-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 11. What is the original number? find the slope and the y-intercept.
y=4x-3