Question

orange are sold at the rate of rs 21 per dozen find the cost of 20 oranges​

Answer 1

Answer:

The cost of 20 oranges will be Rs. 35

Step-by-step explanation:

Here it is given that oranges are sold at a rate of Rs. 21 per dozen

This means that 12 oranges cost Rs. 21

We have to find the cost of 20 oranges

Let us assume the cost of 20 oranges to be x

cost of 12 oranges = 21

cost of 20 oranges = x

                        12x = 20 × 21

                         12x = 420

                             x = 420/12

                             x = 35

Answer 2

Answer:

The cost of 20 oranges​ is Rs. 35

Step-by-step explanation:

1 dozen = 12

The cost of 1 dozen oranges = Rs. 21

The cost of 12 oranges = Rs. 21

By unitary method,

Therefore the cost of 1 orange = Rs. $\frac{21}{12}$

Therefore the cost of 20 oranges = Rs. $\frac{21}{12}$  × 20

                                                       = Rs. 7 × 5

                                                       = Rs. 35