exam Maths Puzzle Numerical Ability

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Pi is the quotient of the circumference "C" and the diameter "D" of a circle.

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exam Other Question

Find the equation of the line with x-intercept 5 and y-intercept 8.
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I got y = -(8/5)x + 8 Is that right? decimal numbers , 7.2 divided by 0.06 =?