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(3a+5c+7e):(3b+5d+7f)

= (3 x 1+5 x 1 + 7 x 1): ( 3 x 2+ 5 x 2+ 7x 2)

= 15 + ( 6 +10+ 14)

=15+20

= 35

= (3 x 1+5 x 1 + 7 x 1): ( 3 x 2+ 5 x 2+ 7x 2)

= 15 + ( 6 +10+ 14)

=15+20

= 35

a=b/2 similarly c=d/2 & e=f/2

(3a+5c+7e)/3b+5d+7e

(3b+5d+7f)/2

------------------- = 1/2

3b+5d+7f