If `a : b=7:9\ a n d\ b : c=15 :7` then what is `a : c ?` `3:5` b. `5:3` c. `7: 15` d. `7: 21`

If a:b=7:9backslash and b:c=15:7 then what is a:c?3:5 b.5:3 c.7:15 d.7:21

If A:B=2:3,7B=9C and 15C=14D then there is A:D

If A:B=2:3,7B=9C and 15C=14D then find A:D

Add : 3b - 7c + 10, 5c - 2b - 15, 15 + 12c + b

" If " A ={3 ,5,7,9} ,B ={5,7,9,11} and C ={ 13,15} "find " A nn ( B uuC)

If (-3)/7=x/(35), then x= (a) 15 (b) 21 (c) -15 (d) -21

If (7a + 8b)/( 7c + 8d) = (7a - 8b)/(7c - 8d), prove that : (i) a:b=c:d (ii) (4a - 5b)/(4c - 5d)= (3a + 4b)/(3c + 4d)