Question

(1) 3:7::
O:
: 21
(2) 7:4::49:
()
(3) 5:8::20:
a
(4)
: 3 ::8:12
(5) 11:13 ::
:39
(6) 7:5 ::
O:
: 30
(7) 3:
O:
:: 15:21
(8) 11:12:: 44:
(9) 13:15 ::
O
: 75
(10) 7:1::49:
()
OOO​

Answer 1

Answer:

I don't understand this question