Question 5 - Mind the Mistake, Mend the Mistake - Chapter 7 Class 7 - Finding the Unknown (Ganita Prakash II)

Last updated at July 17, 2026 by

Checking Solution Steps of the Equation 15w – 4w = 26 [Class 7 Maths] - Mind the Mistake, Mend the Mistake

part 2 - Question 5 - Mind the Mistake, Mend the Mistake - Chapter 7 Class 7 - Finding the Unknown (Ganita Prakash II) - Class 7 (Ganita Prakash 1, 2 & old NCERT)

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Question 5 The following are some equations along with the steps used to solve them to find the value of the letter−number. Go through each solution and decide whether the steps are correct. If there is a mistake, describe the mistake, correct it and solve the equation.Is there a mistake? Yes What went wrong? This solution is very confusing! The student moved the -4w to the right side (becoming +4w), but then in the next step, they just dropped the "w" and treated it like the number 4. Correct solution Now, 15w – 4w = 26 11w = 26 Taking 11 on right side, it becomes division w = 𝟐𝟔/𝟏𝟏

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