Question

( a: b=c: d=e: f=1: 2 )
( (3 a+5 c+7 e):(3 b+5 d+7 f)= )
( frac{a}{b}=frac{c}{d}=frac{e}{f}=frac{1}{2} )
( frac{3 a}{3 b}=frac{5 c}{5 d}=frac{7 e}{7 f}=frac{1}{2} )
( frac{3 a+5 c+7 e}{3 b+5 d+7 f}=frac{1}{2}=1: 2 )

# 29). u: b = c :d=e: f = 1:2, then (3a +50 +7e):(3b + 5d + 7) = ?

Solution