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Q.

The cost of a toy telephone is the same as cost of 4 balls. Express the statement as a linear equation in two variables. Also, find the cost of getting 2 toy telephones packed, if cost of 1 ball is ₹ 5 and there is a fixed cost of ₹ 2 for packing a toy telephone.


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a

x=4y  ,  ₹ 44

b

x=4y  ,  ₹ 22

c

x=2y  ,  ₹ 44

d

x=2y  ,  ₹ 22 

answer is A.

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Detailed Solution

Given the cost of a toy telephone = cost of 4 balls.
Fixed cost for packing a toy telephone = ₹ 2.
Let x represents the cost of a toy telephone and y represents the cost of ball.
⇒   x=4y   ∵the cost of a toy telephone is the same as cost of 4 balls  
Given that, cost of 1 ball is ₹5,
⇒y=5  .
x=4y x=4×5 x=20  
The cost of getting 1 toy telephones packed = ₹20 + ₹ 2 = ₹ 22.
Total cost of getting 2 toy telephones packed = 2 ×  ₹22 = ₹44.
Therefore, x=4y   is the linear equation in two variables and the cost of getting 2 toy telephones packed is ₹44.
Hence, option (1) is correct.
 
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