book Maths Puzzle Numerical Ability

If 4 workers can paint 5 trucks 1 hour, how many will be needed to paint 200 trucks in 8 hours?

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book Other Question

There are 18 animals in the barnyard. Some are chickens and some are cows. I counted 50 legs in all. How many of the animals are chickens and how many are cows? Expand and simplify (2-(1/n))^6

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