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Linear and Quadratic Equations · Question 37 of 66

Question 37

MediumOriginal question

Ritu bought 14 items for a class project, some pens at ₹15 each and some notebooks at ₹40 each, and paid ₹360. How many notebooks did she buy?

6Correct answerYour answer7Correct answerYour answer8Correct answerYour answer9Correct answerYour answer

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CorrectNot quiteAnswer A

Correct answer: A

Let $n$ be the number of notebooks, so $14 - n$ pens.
$40n + 15(14 - n) = 360$ , so $25n + 210 = 360$ .
$25n = 150$ , giving $n = 6$ . (Check: $240 + 120 = 360$ .)

Worth noting

8 is the number of pens, and 9 is $360 \div 40$ , which assumes she bought only notebooks.

Concept: Mixture of two priced items with a fixed total count
Typical timeTypical: 70 s
Your timeYours: —

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