book Maths Puzzle Numerical Ability

Need the formula to find the perimeter of a triangle

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What is the linear equation of time in hrs. in terms of years 1927 L flight took 33.h from NY to Paris and in 1997 it took 3.3h. Use this equation to predict how long it would hav Company Z committed itself to complete an order in 30 days. 20 days later with 60 men on the job only 1/2 the order had been filled. How many more men are needed at this stage in o