book Maths Puzzle Numerical Ability

please answer this question for me- translate the quotient of a number and seven is two into an equation and solve

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book Other Question

(a-x):(b-x)be the duplicte ratio of (a2:b2).Show that 1/a + 1/b = 1/x A tuna can has a diameter of about 8cm and a height of about 3cm.What is the volume of the can?(the possibilites are..........150.72cm^3, 75.36cm^3, 602.93cm^3, or none of these)