How can ΔABC be mapped to ΔXYZ? First, translate vertex A to vertex
.

Next,
ΔABC to align the sides and angles.

X

Rotate

Step-by-step explanation:

correct on edge 2020

We need to determinate who doesn't use anything, so first we must know the real number of who are practising: a person can do more things.

For doing this, is better use a three-circles graphic, but we try to do without it.

So

16 pool + gym + track, and this number is sure38 gym + pool, but this number includes the people of 1st point. We must know who do only gym + pool: 38 - 16 = 2231 pool + track, this number also includes people of 1st point, so: only pool + track 31 - 16 = 1533 gym + track, this number also includes people of 1st point, so: only gym + track 33 - 16 = 17

now:

67 gym, we must know who use only gym: 67 - 16 (gym + pool + track) - 22 (gym + pool) - 17 (gym + track) = 1262 pool, we must know who use only pool: 62 - 16 (gym + pool + track) - 22 (gym + pool) - 15 (pool + track) = 956 track, we must know who use only track: 56 - 16 (gym + pool + track) - 15 (pool + track) - 17 (gym + track) = 8

now we must now who do some facility: let's sum all

16 + 22 + 15 + 17 + 12 + 9 + 8 = 99

99/100 practise something

So only 1/100 doesn't use nothing

The probability is 1%