- A36 kg
- B30 kg
- C33 kg
- D24 kg
Step-by-Step Solution
Level seesaw with equal distances: . Rahul is 36 kg and his brother is kg ignores the 6 kg difference.)
Answer: B) 30 kg
Rahul and his younger brother sit together at one end of a seesaw and their father sits at the other end, the same distance from the middle. The seesaw stays level. How heavy is Rahul's brother?
Class 7Simple EquationsSimple Equations
Key idea: The balance principle
An equation is like a balance scale: LHS on one pan, RHS on the other, and the scale is level. Whatever you do to one side, you must do to the other to keep it balanced. So if you add 5 to LHS, add 5 to RHS. If you divide LHS by 3, divide RHS by 3.
Goal: isolate the variable on one side. Get by itself by undoing every operation around it, in reverse order, applied to BOTH sides.
Goal: isolate the variable on one side. Get by itself by undoing every operation around it, in reverse order, applied to BOTH sides.
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