fallingforyou fallingforyou

23-05-2016
Mathematics

contestada

Which pair of ratios is proportional? A. 5:7 and 25:35 B. 6:9 and 18:36 C. 9:18 and 16:36 D. 35:120 and 75:250

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apologiabiology apologiabiology

23-05-2016

one way is to make into fracitons and simplify

A.5/7=25/35?
yes, true

B. 6/9=18/36?
no

C. 9/18=16/36?
no

D. 35/120=75/250?
no

another way is
if a/b=c/d, then (ad)/(bc)=1 or ad=bc

A is answer

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