Question

In a class, 22 students have been on a plane, 28 on a train, 23 on a boat, 15 on a plane and train, 20 on a train and boat, 14 on a plane and boat, 12 on all three, and 1 on none of them. How many students are in the class?

Answer 1

just add them all together. they equal 135.

Answer 2

no wrong

Answer 3

how's it then?

Answer 4

here we use sets

Answer 5

how did you get to 37?

Answer 6

37

Answer 7

i meant how is the answer 37? wt formula ya used?

Answer 8

we can develop a formula using sets ...