exam Maths Puzzle Numerical Ability

x-7y=3
2x-5y=15

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exam Other Question

How do you simplify a radical when there is a number outside of the square root symbol? For example, a 5 outside of the square root symbol and the radicand is 256?

Thanks. HOW MANY FOUR DIGIT NUMBERS CAN BE FORMED FROM 1,2,3,4,5,6,7 WHICH IS GREATER THAN 3400?