5. If the cost of 12 strawberries is Rs. 300, then the cost of one str

1.	5. If the cost of 12 strawberries is Rs. 300, then the cost of one strawberry is
Answer» Required Solution: Here, we can solve this question in two ways. By using UNITARY method. By using direct VARIATION concept. By using unitary method: ⇒ Cost of 12 strawberries = Rs. 300 ⇒ Cost of 1 STRAWBERRY = Rs. $\sf{\dfrac{300}{12} }$ ⇒ Cost of 1 strawberry = Rs. 25 By using direct variation concept : Let , Cost of 1 strawberry be x. $\small\boxed {\begin{array}{c\|c\|c}\underline{\sf{Number \: of \: strawberries}} & \underline{\sf{12}} & \underline{\sf{1}} \\ \\\underline{\sf{Cost \: (In \: Rs.) }} &\underline{\sf{Rs. \: 300}} &\underline{\sf{x}}\end{array} }$ As LESS is the number of the strawberries , less is the cost of the strawberries.So, it is a case of direct variation. Since, it is the case of direct variation, so $\sf{If \: x \: and \: y \: are \: in \: direct \: variation,then} \\ \\ \bull \: \: \: \sf{ \dfrac{x_1}{y_1} = \dfrac{x_2}{y_2} = \dfrac{x_3}{y_3} = \dfrac{x_n}{y_n} }$ According to the question, ⇒ $\sf { \dfrac{12}{300} = \dfrac{1}{x}}$ By cross multiplication, ⇒ 12(x) = 1(300) ⇒12x = 300 ⇒x = Rs $\sf { \dfrac{300}{12}}$ ⇒x = Rs. 25 Therefore, the cost of one strawberry is Rs. 25.

5. If the cost of 12 strawberries is Rs. 300, then the cost of one strawberry is

Answer»

Required Solution:

Here, we can solve this question in two ways.

By using UNITARY method.
By using direct VARIATION concept.

By using unitary method:

⇒ Cost of 12 strawberries = Rs. 300

⇒ Cost of 1 STRAWBERRY = Rs. $\sf{\dfrac{300}{12} }$

⇒ Cost of 1 strawberry = Rs. 25

By using direct variation concept :

Let ,

Cost of 1 strawberry be x.

$\small\boxed {\begin{array}{c|c|c}\underline{\sf{Number \: of \: strawberries}} & \underline{\sf{12}} & \underline{\sf{1}} \\ \\\underline{\sf{Cost \: (In \: Rs.) }} &\underline{\sf{Rs. \: 300}} &\underline{\sf{x}}\end{array} }$

As LESS is the number of the strawberries , less is the cost of the strawberries.So, it is a case of direct variation. Since, it is the case of direct variation, so

$\sf{If \: x \: and \: y \: are \: in \: direct \: variation,then} \\ \\ \bull \: \: \: \sf{ \dfrac{x_1}{y_1} = \dfrac{x_2}{y_2} = \dfrac{x_3}{y_3} = \dfrac{x_n}{y_n} }$

According to the question,

⇒ $\sf { \dfrac{12}{300} = \dfrac{1}{x}}$

By cross multiplication,

⇒ 12(x) = 1(300)

⇒12x = 300

⇒x = Rs $\sf { \dfrac{300}{12}}$

⇒x = Rs. 25

Therefore, the cost of one strawberry is Rs. 25.