Practice30Create account

The second line of a student's working reads . Which equation was the first line?

Class 7Simple EquationsSimple Equations
  • A
  • B
  • C
  • D

Step-by-Step Solution

The 14 has just crossed the '=' sign and arrived as +14, so on the left it must have been −14: the first line was . Finishing: → , and ✓. Had the first line been , the second would read — transposing flips the sign, it never copies it.
Answer: B)

Key idea: Translating word problems into equations

Three steps:
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**

Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Simple Equations practice questions

More Class 7 Simple Equations practice

Solving 5x + 12 = 47, Kabir wrote 5x = 47 + 12 and answered x = 11.8. What is his error…To solve 8x = 96, Sneha wrote 8x ÷ 8 = 96 and gave the answer x = 96. What went wrong?An auto-rickshaw in Nagpur charges a fixed ₹40 plus ₹20 for every kilometre travelled.…In a quiz every correct answer scores 5 marks and every wrong answer loses 2 marks. Anil…The sum of three consecutive odd numbers is 81. What is the largest of the three?