exam Maths Puzzle Numerical Ability

Could someone please take the time to help me solve the question: Solve the following system of two linear equations by substitution: x + 2 y - 8 =0 & 2 x + 4 y + 4 =0. Noting each

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exam Other Question

I have tried this problem i got to the part where im supposed to find a common denominator, and am having trouble finding that. Please help me.
Thank you. 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?