Question

cost of 4 dozens bananas is rupees 60 how many bananas can be purchased for rupees 12.50 .

do by ratio and proportions

Answer 1

Cost of 4 dozen bananas ,i.e. 48 bananas = Rs.60
Cost of 1 banana = Rs.60÷48 = Rs.1.25
Number of bananas that can be purchased in Rs.12.50 = Rs.12.50÷Rs.1.25 = 10 bananas

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Answer 2

4 dozens means 12×4 bananas
that is 48 bananas
48 bananas - 60 rupees
x bananas-12.50
by cross multiplication
x=48 ×12.50/60
x=10
that means 10 bananas can be bought by 12.5 rupees