exam Maths Puzzle Numerical Ability

Find the slope of the line passing through the points (7,-1) and (10,-1)

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exam Other Question

How many liters of a solution containing 22% sugar and how many liters of anothwer solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27 A telephone number consist of seven digits the first three representing the exchange. How many different telephone numbers are possible with in the 537 exchange?