Ann bought 30 pens for Rs 4.20 each.If she had used this amount of money to buy pencils for 3 for Rs 5,how many pencils could she have bought

30*4.2

--------
5/3

75.6 To find out how many pencils Ann could have bought, we need to compare the total amount of money she spent on pens with the cost of pencils.

First, let's calculate the total amount Ann spent on pens:
Total cost of pens = Cost per pen * Number of pens = Rs 4.20 * 30 = Rs 126

Now, let's find out how many pencils Ann could have bought with Rs 126:
Cost of 3 pencils = Rs 5
Cost of 1 pencil = Rs 5 / 3
Number of pencils Ann could have bought = Total cost of pens / Cost of 1 pencil
Number of pencils = Rs 126 / (Rs 5 / 3)

To find this value, simply divide Rs 126 by Rs 5/3:
Number of pencils = Rs 126 / (Rs 5 / 3)

Dividing a number by a fraction is the same as multiplying the number by the reciprocal of the fraction.

Reciprocal of Rs 5/3 = 3/5

So, multiply Rs 126 by 3/5 to find the number of pencils Ann could have bought:
Number of pencils = Rs 126 * (3/5)

Let's calculate this:
Number of pencils = Rs 126 * (3/5)

By multiplying, we get:
Number of pencils = Rs 378 / 5

Dividing Rs 378 by 5 gives us the final answer:
Number of pencils = 75.6

Since we cannot have a fraction of a pencil, the maximum number of pencils Ann could have bought is 75.