Mathematics probability (statistics 1) help?????!

of the students in a year who took maths :

- 50% took physics
- 35% took chemistry
- 40% took neither physics or chemistry

1 pupil is chosen at random:

1) find the prob. that the pupil took physics and chemistry.

2) given that the pupil took one of physics or chemistry, find the prob. that it was physics.

thanks in advance :)

1) 50% x 35% = 17.5%
2) (50% + 35%) / 2 = 42.5%

Here ya go buddy

Thats more then 100%? Thats like 11 kids picken between 10 popsicles and all of them get one?