exam Maths Puzzle Numerical Ability

multiply

(4x + 1)(2x^2 +x + 1)

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Sam stuffs shrimp in his job as a seafood chef. He can stuff 1,150 shrimp in 7 hours. When his sister helps him, they can stuff 1,150 shrimp in 4.5 hours. If Sam gets sick, how long will it take his sister to stuff 575 shrimp? Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. State whether your numb