NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 4: Simple Equations - Problems and SolutionsQuestion 100
Class 7 - Mathematics - Unit 4: Simple Equations - Problems and Solutions
Question. 100
Look at this riddle:
If 7 pencils would cost you ₹6 more than 5 pencils, then find the cost of your 10 pencils.
Answer:
₹30
Detailed Answer with Explanation:
Let cost of 1 pencil = x.
7x − 5x = 6 ⇒ 2x = 6 ⇒ x = 3.
Cost of 10 pencils = 10 × 3 = 30.