s/20+ s/30= s/12 how?
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lcm of 20 and 30 is 60 so,
20×3=60
30×2=60 so
(3s+2s)÷ 60=5s÷60=s÷12=s/12
20×3=60
30×2=60 so
(3s+2s)÷ 60=5s÷60=s÷12=s/12
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