A / 12=5 24/a=3 a/7=13 a*3=30

Question

A / 12=5 24/a=3 a/7=13 a*3=30

Answer 1

а : 12 = 5
а = 12 * 5
а = 60

24 : а = 3
а = 24 : 3
а = 8

а : 7 = 13
а = 13 * 7
а = 91

а * 3 = 30
а = 30 : 3
а = 10