exam Maths Puzzle Numerical Ability

-xy2
x3y2 my ? is if you first eliminate the y2 or you subtract the -x to x3?

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exam Other Question

Bob can do a job in 1 hour, John can do the same job in 2 hours, Lisa can do the same job in 3 hours. How long would the job take if they all work together? what is v=c(1-t)over n what is n