1. In a class of 32 students, 18 offer Chemistry, 16 offer Physics and 22 offer Mathematics, 6 offer all three subjects, 3 offer Chemistry and Physics only and 5 offer Physics only. Each student offers at least
one subject. Find the number of students who offer
(a) Chemistry only
(b) only one subject
(c)
only two subjects

Step-by-What do we call the cloud of gas and dust from which a star forms?

a.

a quasar

b.

a pulsar

c.

a nebula

d.

a neutrino

step explanation:

found it xd it ok yt

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.