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Q.

A person buys 18 local tickets for Rs 110. Each first class ticket costs Rs 10 and each second class ticket costs Rs 3. What will another lot of 18 tickets in which the numbers of first class and second class tickets are interchanged cost?

 A.

112

 B.

118

 C.

121

 D.

124

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Solution:
Option(D) is correct

Let there are $x$ first class ticket

Total cost $=10x+3(18−x)$

$⇒ 10x+54−3x=110$

$⇒ 7x=56$

$⇒ x=8$

If the first class and second class tickets are interchanged.

Then total cost $=10×10+3×8=124$


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