Forty-Five S Equal To Twelve More Than Thrice A Number

Forty-five s equal to twelve more than thrice a number

  Equation : 45 = 12+(n)3
(tip:understand the question)
*Using working backwards method
45-12 ( the opposite of addition is subtraction) 45-12 = 33
(n)3 means multiplication (the opposite of multiplication is division)
33 divided by 3 equals to 11
n=11
*Using inverse operations method
Ex. 12+(n)3= 45
-12 -12
(n)3=33 (33/3)
n=11