exam Maths Puzzle Numerical Ability

A dealer wishes to produces 300 gallons of oil worth $0.40/quart. He has oil worth $0.36/quart and oil worth $0.52/quart. How many quarts each should he mix?
____qts of $0.36

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i seem to have forgotten everything i knew about calculations with numbers expressed as powers of 10. ie: the difference between 6.022x10 to the power of 23 and 6.24 times 10 to the power of 25. help bob 74 yrs old 8 yrs of college curses To form a 10% copper alloy weighing 75 grams, a 6% copper alloy is combined with an 18% copper alloy. How much of each type should be used?