exam Maths Puzzle Numerical Ability

I need help with problem 54 in section 9.4

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How many pounds of hamburger that $1.60 per pound must be mixed with 70 pounds of hamburger that costs $2.10 per pound to make a mixture that costs $1.70 per pound? A rabbit needs 300ug/kg (300 micrograms per kilogram) of a 1% ivermectin solution. If the rabbit weighs 8 lb, how many milliliters of ivermectin should be given?