exam Maths Puzzle Numerical Ability

The formula R= -0.075t+3.85 can be used to predict the world record in the 1500 meter run, t years agter 1930. Determining an inequality that identifies the years in which the world record will be less than 2.8 minutes. Sovle for t. Thanks for your time.

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exam Other Question
six years ago bob was four times as old as mary. in four years he will be twice as old as mary. how old are they now? use a system of equations. Solve the following simultaneous equation
32x^2+15y^2=2112
7x^2-3y^2=60