Question

Ekta earns ₹1500 in 10 days. How much will she have earned after 7 days (1 week)? How many weeks will it take for Ekta to earn ₹3150?

Answer 1

Earnings of 10 days = ₹1500

Applying unitary method,

Earning of 1 day = $\frac{1500}{10}$ = ₹150

Earning of 7 days/1 week = 150 $\times$7 = ₹1050

So, time taken to earn ₹1050 is 1 week.
Time taken to earn ₹1 is $\frac{1}{1050}$ weeks
Time taken to earn ₹3150 is $\frac{1}{1050}\times 3150=3$ weeks.