exam Maths Puzzle Numerical Ability

Do I divide the circumference of a circle by four to get the perimeter of a quadrant?

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exam Other Question

The difference of two numbers is 33. The second is 7 less than 3 times the first. What are the two numbers?

I think the answers are 20 and 53, but I am getting confused...Can you help?

Thanks For the exponential function ex and logarithmic function log x, graphically show the effect if x is doubled.