exam Maths Puzzle Numerical Ability

An oil tank was 1/10 full then 280 gallons was delivered which made it 8/10 full. If x= the capacity of the oil tank, what equation can be used to find the capacity of the tank?

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exam Other Question

Please help if you can.

Find the Half-Life or Doubling Time for the following:

Q=1000e^0.5t

I have no idea where to go with this one. Thank you for any help you can offer. i have been given this problem in my homework

1.866^(x-2)=1/1.244^(4.x)

any help with it would be greatly used
many thanks x