Mahabir Singh Solutions for Chapter: Real Numbers, Exercise 2: EVERYDAY MATHEMATICS

In a seminar the number of participants in mathematics, physics and biology are $192, 240$ and $168$. Find the minimum number of room required if in each room same number of participants is to be seated and all of them being in the same subject.

Sam, Advik and Trishu go for a morning walk. They step off together and their steps measure $35 \mathrm{cm}, 32 \mathrm{cm}$ and $40 \mathrm{cm}$ respectively. What is the minimum distance each should walk so that each can cover the same distance in complete steps?

A boy multiplied $987$ by a certain number and obtained $559981$ as his answer. If in the answer both $9$s are wrong and the other digits are correct, then the correct answer would be

Four different electronic devices make a beep after every $30$ minutes, $1$ hour, $1\frac{1}{2}$ hour and $1$ hour $45$ minutes respectively. All the devices beeped together at $12$ noon. They will again beep together at