exam Maths Puzzle Numerical Ability

Ten 6.0-V and 12-V batteries have a total voltage of 84 V. How many of each type are there?

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I just want to know if i am correct can someone check them for me please.

Technology. Driving down a mountain, Tom finds that he has descended 1800ft in elevation by the time he how do you write .46 repeating as the quotient of two integers?