exam Maths Puzzle Numerical Ability

(n-1)(n)(n+1)=210

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exam Other Question

Anna can swab the deck in 8 hours. Alex can do the same thing in only 5. If they work together how long will it take them to swab the deck? can somebody please help me understand how to go about this question:
Find the term not involving y in the expansion of (1/y^3+y^2)^5. Please help!! Thank you.