Question

(b) The average age of 19 boys in a class is 21 years. If the teacher's age is included, the average
increase to 22 years. What is the teacher's age?
एक कक्षा में 19 लड़कों की औसत आयु 21 वर्ष है। यदि शिक्षक की आयु को शामिल किया जाता है, तो
औसत 22 वर्ष तक बढ़ जाता है। शिक्षक की आयु क्या है?​

Answer 1

Answer:

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Answer 2

Answer:

let the sum of all students age be x

$\frac{x}{19} = 21$

$x = 21 \times 19$

$x = 399$

Now the age of teacher will be included so it will be x+y ok and the total number will be 19+1=20

$\frac{x + y}{20} = 22$

$x + y = 22 \times 20$

$x + y = 440$

and we know that x = 399

$399 + y = 440$

$y = 440 - 399$

$y = 41$

therefore age will be 41

Step-by-step explanation:

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