book Maths Puzzle Numerical Ability

The average distance between the earth and the sun is 93 million miles. Using the velocity of light (which is 186000 mi per second) find an approximate value for the amount of tim

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Tom is 8. His mom is 31. How long before she is twice his age? I am trying to home school my son and I am having difficulty in explaining the steps for this quadratic equation problem in completing the square.
0.4x2 + 1.1 =2
I know that you have to multiply the decimals by 10 to get rid of the decimals.