How do I solve this for a and b? 7/b-36=a/72=28/b

We were shown how to do multi steps but not multiple variables.

A total of 100 students play on the Sports Academy's soccer, track, or basketball teams. No student plays on more than one team. 61 of the students are boys. There are 36 students on soccer teams, 19 are on the girls' soccer team.

What is the unit rate of 7 hours to 600 miles

5/8 x 6 will be less than or greater than 5/8

11,235,000,000 in scientific notation

Th99 divided by a number (n) is 44

One supplementary angle is 15 degrees less than twice the other. Find the measure of the two angles.

Least to greatest 4 1/2, 4.504, 4.43, 113/25

72 divided by X equals X

Which of these is a multiple of 6? A) 20 B) 62 C) 24 D) 26

A bag contains x blue chips and y red chips. If the probability of selecting a red chip at random is 3/7, then x/y.