exam Maths Puzzle Numerical Ability

Three times a number, added to4 is 7. Find the number

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exam Other Question

If a document that is 6 inches long is traveling 250 inches per seconds past a transport sensor,how long in milliseconds will the sensor be covered? find an equation of the line satisfying the given conditions.

parallel to the line 2x+y=3 and through (-2,3)