Question
The average age of 32 children and their teacher's age
are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?Solution
sum of the age of total children = 33 × 28 = 924 Sum of the age of children after excluding teacher = 32 × 27 = 864 Teacher’s age = 924 – 864 = 60 years
A body is said to be in equilibrium when:
Which polymer is used in the production of bullet-proof materials?
Which one among the following statements is not true for Mammals?
Which of the following is a chemical change?
Which vitamin is also known as Vitamin-B2?
If the root mean square speed of gas molecules is doubled, the absolute temperature of the gas:
Which vitamin helps in improving night vision?
Which vitamin is essential for RBC formation?
Which of the following statements for the given chemical reaction is true?
Fe₂ O₃ + 2Al → Al₂ O₃  + 2Fe
The force which opposes the relative motion between different layers of liquid or gases is called –
