(b) 73km/h 23. (a) 75km/h (c) 72km/h (d) 70km/h Average age of 11 students of a team was 11 years. If age of coach is added to their age, their average age becomes 12 years. What is the age of the Coach? (a) 13 Years (b) 19 Years (c) 23 years (d) 24 Years 50 Paisa coins and Rs. 1 coins are in ratio of 2:5 in a Coin box respectively. If the average 24.
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Step-by-step explanation:
total student ×ave age
11×11=121
total student + teacher×ave age
(11+1) 12×12(after coach age new average is 12)=144
144-121=23
age of coach is 23
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