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3/8 : 4/16
= 3/8 x 16/4
= 3/1 x 2/4
= 6/4
= 1 2/4
= 1 1/2
1/7 : 8/21
= 1/7 x 21/8
= 1/1 x 3/8
= 3/8
3/7 : 9/14
= 3/7 x 14/9
= 1/1 x 2/3
= 2/3
(2/3 + 6/7) : 13/27
= (14/21 + 18/21) : 13/27
= 32/21 : 13/27
= 32/21 x 27/13
= 32/7 x 9/13
= 288/91
= 3 15/91
[answer.2.content]
