Please bantuannya no 5-7 pake cara yg kalian ketahui. jangan asal-asalan ya...makasih

5. 30/40 = x/60
x = 30× 60/40
= 45 cm
6. a = 9/a =12/16
a = 9.16/12
= 12 cm
b = b/20 = 12/16
b = 20.12/16
= 15 cm
c = c/8 = 12/16
c= 8.12/16
= 6 cm