exam Maths Puzzle Numerical Ability

Find the value of x so that the line passing through (10,5) and (x,9) has a slope of -2.

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exam Other Question

Find the quotient.
12 3/4 divided by ( - 11/12 )

Thanks! Happy Holidays! if one planes rate is 30 mph and the time is 210 and the other plane rate is 40 mph with the same time what is the distance the planes traveled?