Question

If half a kilogram of onions costs, Rs20, how much will 300 grams of onion cost?
A) Rs 15
B)Rs 12.5
C) Rs 12
D)Rs 10

Answer 1

Hi ,

It is related to Direct proportion.

The value of x increases ( decreases ) ,

value of y also increases ( decreases) in

such a way that the ratio x / y doesnot

change ; it remains cinstant ( say k ) .

Two numbers x and y are said to vary in

direct proportion if x / y = k or x = ky where

k is a constant.

In our case , if y1 , y2 are the values of y

corresponsing to the values x1 ,x2 of x

respectively , then

x1 / y1 = x2 / y2


According to the given problem ,

Half a kilogram of onions costs Rs 20

x1 = 1 /2 kg onions = 500 gr ;

y1 = Rs 20 ;

Let the Cost of 300gr onions are Rs y2

x2 = 300 gr ;

y2 = ?

x1 / y1 = x2 / y2

500 / 20 = 300 / y2

Therefore ,

y2 = ( 300 × 20 ) / 500

y2 = 3 × 4

y2 = 12

Cost of 300grams onions = Rs 12

Option ( C ) is correct.

I hope it helps you.

****

Answer 2

Answer:

The cost of 300 grams of onion is Rs.12.

Step-by-step explanation:

One kilogram is equivalent to 1000 grams.

So, half a kilogram will be 500 grams.

It is given that 500 g of onion costs Rs. 20.

Therefore, 300 grams of onion costs = (300×20)/500

                                                              = 12

Thus, 300 grams of onion costs Rs. 12.

#SPJ2