exam Maths Puzzle Numerical Ability

Here is my problem: My ID number is quite remarkable. It's a 9 digit number with the digits 1-9 appearing only once. The entire 9 digit number is divisible by 9. If you remore t

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exam Other Question

Which expression represents the sum of the opposite of a number and -12?

A) -n = -12

B) -n + -12

C) -n(-12)

D) -n - (-12)

Thank you for the help Find the half-life of a radioactive substance that is reduced by 30% in 20 hours