What is rational and irrational numbers?

Rational numbers are whole and can be divided evenly irrationals are mixed numbers and can be negative

Rational numbers are numbers that can be defined specifically such as 3/4, or numbers that are not continuous such as integers. 

Irrational numbers are numbers that cannot be specifically defined, which go on forever and never cease. Such as pi. 

5:

No, the ratios are not equivalent. If it was then instead the second one would be 60 computers and 48 students. This is because it has to be the same amount multiplied by 2 or adding the number value as many times as you want. In this case 30 + 30 = 60 not 70. 24 + 24 = 48, not 40.

6:

Yes, this ratio is equivalent. 4 x 15 = 60. Add another 15 and its 75. So 5 fifteen's = 75. Now for the other ratio, we just need to know how many times 4 can go into 20. 5 times because 4 x 5 = 20. So yes, this ratio is equivalent.

7:

This ratio is not equivalent, 6 can go into 36 six times. 12 cannot go into 60 six times but instead 5 times. So no, this ratio is not equivalent.

P.S

Have an Amazing Day and Good Luck!

-Faker/Tosrel