There are 13 students in a biology class and 12 students in a chemistry class. if there are 20 students in total, how many students are in both classes?

There are 5 students in both classes. Have a great day!

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation:

1; 35 is the ratio

step-by-step explanation: