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Calling the unknown number x:
x + 15 = -12
Subtract 15 from both sides:
x = -27
The number is -27.
-15
5 + -8 = 3 + 12 -3 is not equal to 15
In math problems without punctuation such as brackets, the standard convention in to solve from left to right. Therefore, you would solve the problem 15-3 times 4 plus nine like by three actions. 15-3 equals 12; 12 times 4 equals 48; 48 plus 9 equals 57.
The product of 12 times 15 is 180. This can be calculated by multiplying 12 by 15, as each digit in the first number is multiplied by each digit in the second number, and then adding the results together. In this case, 12 times 15 equals 180.
The answer is 27. 10+15=25. 25+2=27.