book Maths Puzzle Numerical Ability

please help me solve this equation : (2x^3-3x^2-18x-8)/(x-4)

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book Other Question

How many pounds of candy selling for $5.80 per pound should be mixed with 7 pounds of candy selling for $2.40 per pound to obtain a mixture selling for $3.42 per pound? The executive committee of the student government consists of 10 members. In how many ways can a subcommittee of 3 members be chosen? Thank you for your help.