exam Maths Puzzle Numerical Ability

I need help factoring this:
15a^2b^2-10ab^4+5ab^2

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exam Other Question

x punds of candy valued at $3.50 per pound is mixed with y pounds of candy valued at $4.30 per pound to produce 10 pounds of a mixture selling for $4 per pound. Find x and y, the number of pounds of each type. the greater of two consecutive even integers is six less than three times the lesser