Question

6. Cost of one dozen oranges is Rs.21.
(a) Find the cost of one score oranges.
(b) How many oranges can be purchased for Rs. 19.25?

Answer 1

Question

6. Cost of one dozen oranges is Rs.21.

(a) Find the cost of one score oranges.

(b) How many oranges can be purchased for Rs. 19.25?

ANSWER :

Cost of one dozen oranges = Rs.21

OR

Cost of 12 Oranges = Rs.21    [ $\therefore$ as 1 dozen = 12 ]

So,

Cost of 1 Orange = $\frac{21}{12}$ = Rs. 1.75

Now,  

To be found :-

(a) cost of one score oranges

(b) number of oranges that will be purchased for Rs. 19.25

So,

(a) cost of one score oranges

= 1.75 × 20          [ $\therefore$ as, 1 score = 20 ]

= Rs.35

(b) number of oranges that will be purchased for Rs. 19.25

= $\frac{19.25}{1.75}$

= 11 oranges

Hence,

(a) cost of one score oranges is Rs.35

(b) number of oranges that will be purchased for Rs. 19.25 is 11 oranges

Answer 2

$<b>$

(a) Cost of one Dozen Oranges = Rs. 21

One Dozen = 12

$\implies$ 12 Oranges = Rs. 21

$\implies$ 1 Oranges = Rs. $\frac{21}{12} = 1.75$

$\implies$ 1 Oranges = Rs. 1.75

One Score = 20

Cost of One Score of Oranges = 20×Rs.1.75 = Rs. 35

(b)
Total cost of x Oranges = Rs. 19.25

Cost of 1 Orange ---- Rs. 1.75.
Cost of x Oranges --- Rs. 19.25

Cross Multiply
1×19.25 = 1.75×x.

$\implies x = \frac{19.25}{1.75}$

$\implies x = 11$

11 Oranges can be purchased for Rs. 19.25