exam Maths Puzzle Numerical Ability

When 3 times a certain number N is added to 6, the sum is 20 more than the original number. What is the number N?

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exam Other Question

7-2n=n-14 Can you help me finging the solution The type of question is equation with variables on both sides. my answer was -21 I am not sure if i am right. Lane invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1,430,
how much did she invest at 15%?