Question

Out of 40 student, 19 can swim backstroke and 30 student can swim sidestroke.

If 14 students can swim both ways, how many student can swim sidestroke

Answer 1

Answer:

5

Explanation:

If you mean:

If you mean:Out of 40 student, 19 can swim backstroke and 30 student can swim sidestroke.

If 14 students can swim both ways, how many student can swim only sidestroke

If 14 students can swim both ways, how many student can swim sidestroke

If 14 students can swim both ways, how many student can swim sidestroke

n(Backstroke) = 19

n(Sidestroke) = 30

n(Both) = 14 = n(Backstroke ∩ Sidestroke)

Now,

The total number of students is given by,

n(only sidestroke )= n(Sidestroke) - n(Backstroke ∩ Sidestroke)

= 19-14

= 5