02-03-2015
Mathematics

contestada

Translate into an equation and solve.
Twenty-one is three times the difference between three times a number, n, and five.

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Panoyin Panoyin

02-03-2015

21 = 3(3n - 5)
21 = 3(3n) - 3(5)
21 = 9n - 15
+15 +15
36 = 9n
9 9
4 = n

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