exam Maths Puzzle Numerical Ability

Will the quadratic equation work on an equation such as x^2 - 3=0?

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exam Other Question

Two cars leave City A at the same time to travel to city B. One car travels at 72 km/h and other at 78 km/h. If the slower car arrives 20 min. after the faster car, how far apart are City A and City B? The tens digit of a certain number is 3 more than the units digit. The sum of the squares of the two digits is 117. Find the number.