exam Maths Puzzle Numerical Ability

Welding: A type of steel sheet weighs 3.125 lb. per square foot. What is the weight of a piece measuring 24 in. by 108 in.? (Hint: Be careful of units.)

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Could someone please help me with this problem?
Solve for the indicated variable:
y+1/x-2=2/3 (solve for y)
Thank you in advance!!!! show n!+1 and (n+1)!+1 is relatively prime. Hint: multiply n!+1 by (n+1). Thanks