exam Maths Puzzle Numerical Ability

Find all whole numbers x such that GCD(24,x)=1 and 1 ≤ x ≤ 24.

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exam Other Question

A cashier has a total of 126 bills, made up of fives and tens. The total value of the money is $840. How many of each kind does he have? Find the equation of each line. Write each answer in clope intercept form.

The line is parallel to -3x + 2y = 9 and contains the point (-2,-1).
I got 2y=-3x + 9 which is slope intercept form
answer I got was y= 3/2x + 4 which is incorrect