book Maths Puzzle Numerical Ability

A group of 10 6-volt & 12-volt batteries are wired in series. The sum of their voltages is 84 volts. How many of each type of battery are used.

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Hi, I need help on the following problem. Thanks!

The growth strain of bacteria is known to be exponential in nature. After an elapsed time of three hours the population in a
53x + 31y=1101
59x + 33y=1203