Let x represent the unknown number and use the known numbers to solve. Set up the equation:
x + 9 = 15 (subtract 9 from each side to solve for the unknown number)
x = 6
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Nine plus fifteen is 24!
Nine less than twice a number equals the same number increased by four?
nine and three hundred fifteen thousandths is 9315/1000 or 9.315 in decimal format.
Fifteen is to five as nine is to three, because 15 divided by 3 equals 5, and 9 divided by 3 equals 3.
1,2,3,4,5,6,7,8,10,11,12,13,14,15,16