exam Maths Puzzle Numerical Ability

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

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A colony of bacteria has 6.5 X 10^6 members at 8 A.M. and 9.75 X 10^6 members at 10:30 A.M. Find its population at noon.

I used the formula N = No X 2 ^ t/d

9.75 X 10^6 = 6.5 X 10^6 X (2)^ 2.5/d

how do i work from here? 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