Answer:
33.75 minutes
Explanation:
Let's start by assigning a variable to represent the number of minutes Tony spent studying for his biology test. Let's call that variable "b".
According to the problem, Tony spent 5 more than 3 times the amount of minutes he spent studying for his biology test on his algebra test. So we can write an equation:
Total minutes studying for algebra test = 5 + 3b
And we know that the total time Tony spent studying for both tests was 140 minutes, so we can write another equation:
Total minutes studying = minutes studying for algebra test + minutes studying for biology test
Now we can use these two equations to solve for "b", the number of minutes Tony spent studying for his biology test.
Total minutes studying for algebra test = 5 + 3b
Total minutes studying = 140
We can substitute the first equation into the second equation:
(5 + 3b) + b = 140
Simplifying this equation, we get:
4b + 5 = 140
Subtracting 5 from both sides:
4b = 135
Dividing both sides by 4:
b = 33.75
So Tony spent 33.75 minutes studying for his biology test.