exam Maths Puzzle Numerical Ability

an elevator at a construction site has a maximum capacity of 2500 pounds. if the elevator operator weights 160 pounds and each cement bag weighs 60 pounds, how many bags of cement can be safely lifted on the elevator in one trip?

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Three new ink cartridges cost $9 less than 5 new cartridges. Write and solve for the cost of each cartridge 63. -6x-3[2x-5(x+8)]-6 and 65. 1/2(x+3)+1/3(3x+6) these two problems i am not sure how these are worked out.