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In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Need showing work for this problem 56.25 ×25.80

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these