Question

Mark spent twice as long on his psychology homework as he did on his biology homework. If he spent 180 min on the two combined, how long did he spend on his biology homework

Answer 1

Answer: Let's denote the time Mark spent on his biology homework as "x" minutes. According to the given information, he spent twice as long on his psychology homework, which means he spent "2x" minutes on his psychology homework.

The total time spent on both subjects is 180 minutes, so we can write the equation:

x (biology time) + 2x (psychology time) = 180

Now, let's solve for "x":

3x = 180

Divide both sides by 3:

x = 180 / 3

x = 60

So, Mark spent 60 minutes on his biology homework.