Question

which of tje following are in proportion ?
a) 6:8 ::5:15
b) 3:7 :: 2:7
c) 10:21 :: 4:8.4
d) none of these

Answer 1

c))))as 21×4=48
10×4.8=48

Answer 2

I think c) 10:21::4:8:4 is the correct answer