exam Maths Puzzle Numerical Ability

The diameter of a small pizza is 16 centimeters. This is 2 centimeters more than two fiths of the diameter of a large pizza. Find the diameter of the larger.

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June is 1 year younger than her husband Lee. The product of there ages is 650. How old is each?

x(x+1)=650 Erynn walked at a constant rate for 2 hours and bicycled at three times that rate for 1/3 hours. She traveled 12km in all. What was her walking rate?