135 ; If you are allowed to use a calculator to determine percents you can do 300 × 45% = and it gives you your answer.
We can set Maggie's age to x
If her brother is six years younger than four times her age, than her brother must be equal to: 4x-6
Since the sum of their ages is 39, we can set up an equation.
(Sum of Maggie's age) + (sum of Maggie's brother's age) = 39
x + (4x -6) = 39
5x -6 = 39
5x = 45
x = 9 , Maggie's age is 9
Answer:
49
Step-by-step explanation:
3x + (-2x) would be just subtracting 2x from 3x, so it would be 1x or x. Hope this helped<3