SOLUTION: two-thirds of a certain number increased by one-half of the number 21. Find the number.

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Question 992109: two-thirds of a certain number increased by one-half of the number 21. Find the number.
Answer by josgarithmetic(39623) About Me  (Show Source):
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n, the number;
%282%2F3%29n%2B%281%2F2%29n=21

2%2A3%282n%2F3%29%2B2%2A3%28n%2F2%29=2%2A3%2A21

2%2A2n%2B3n=126

7n=126

n=126%2F7

n=18