Question 9 of 17beginner🔧 ApplyNumerical2 marks

If 24 pencils cost ₹120, how much will 20 such pencils cost?

Correct Answer

Given: Cost of 24 pencils = ₹120

Step 1: Find cost per pencil. Cost per pencil = ₹120 ÷ 24 = ₹5

Step 2: Calculate cost for 20 pencils. Cost for 20 pencils = 20 × ₹5 = ₹100

Answer: 20 pencils will cost ₹100.

Exercise: Figure it Out (Section 4) | Q: 2 | (Page Page 13)
For More Understanding

Explanation

The chapter explains direct proportion using the rule of three. Cost and number of pencils are directly proportional. Cost per pencil = ₹120 ÷ 24 = ₹5. For 20 pencils: 20 × ₹5 = ₹100.

Solution Steps

  1. Step 1: Find cost per pencil: ₹120 ÷ 24 = ₹5 per pencil

  2. Step 2: Calculate cost for 20 pencils: 20 × ₹5 = ₹100

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