W If x : y = 5:7, then (7x + 5y) : (21x + 4y) = ?
(a) 10:19
(b) 12:19 D
(c) 12:17
(d) 10:17
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Answer:
(c) 12:17
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10:19
:=5:7
(7+5):(21+4)=(7×5+5×7):(21×5+4×7)
=(35+35):(105+28)
=70:133
=10:19
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