Doug is playing Super Mario Brothers. He finished 1/4 of the levels last week and 1/2 of the remaining levels the week. He had 15 more levels to complete. How many levels does Super Mario Brothers have?

Answer 1

x = number of levels

He finished x / 4 of the levels.

Remaining levels = x - x / 4 = 3 x / 4

He finished 1 / 2 of the remaining levels.

He finished ( 1 / 2 ) ∙ 3 x / 4 = 3 x / 8

He totaly finished x / 4 + 3 x / 8 = 2 x / 8 + 3 x / 8 = 5 x / 8

Total remaining levels = x - 5 x / 8 = 3 x / 8

Total remaining levels = 15

3 x / 8 = 15

Multiply both sides by 8

3 x = 120

Divide both sides by 3

x = 40

Answer 2

Or, ya know, use a calculator, its easy, and quick. ._.

Answer 3

While a calculator can indeed make the calculation quicker, it's always good to understand the process of solving a math problem in case a calculator is not available or the problem involves more complex calculations. Additionally, understanding the process helps in building problem-solving skills and enhancing mathematical understanding.

Answer 4

mine gives me the explanation, and answer.

Answer 5

That's great! Using a calculator that provides the explanation and answer can be very helpful in understanding the steps involved in solving a math problem. But in cases where a calculator is not available or it's important to understand the process, knowing how to solve the problem step by step can be very useful.