Average age of 20 students of a class is 10 years. Average age of these students together with their five teachers is 14. The age of Ramesh Sir, one of their five teachers, is exactly the same as the average age of all their five teachers. The sum of the ages (in years) of all the students and Ramesh Sir is
Given:
Average of 20 students = 10 years => Sum of students = 20 × 10 = 200.
Average of (20 students + 5 teachers) = 14 => Total sum (students + 5 teachers) = 25 × 14 = 350.
Formula:
Required sum = (Sum of students) + (Age of Ramesh) = 200 + 30.
Solution:
Sum of ages of 5 teachers = 350 − 200 = 150.
Ramesh's age = average age of the 5 teachers = 150 / 5 = 30.
200 + 30 = 230.
Correct Answer: (c) 230
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A man on a cycle is travelling on a terrain whose height (h) vs distance (d) can be described by a function in a certain unit (h can be negative). Starting at d = 0, the cycle will have the maximum velocity without pedaling at:
Which of the following is true?
If any 9 papers are drawn from a both side printed book, the sum of their page numbers can NEVER be ______.
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If a map is placed in such a manner that east becomes southeast, then what will northeast become?
A pilgrim starts walking for a journey of 115 km. On the first day he covers 7 km, the next day 9 km, and likewise keeps adding 2 km everyday till he reaches 15 km per day which he maintains for the rest of the journey. How many days in all will he take to complete the journey?
The areas (in km²) under forests in four countries A, B, C and D for the years 2014 and 2024 are shown in the given bar chart:
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A 2 cm wide wooden strip is to be fixed on a photo of 40 cm × 30 cm size all along its four sides. What is the minimum length of the wooden strip required?
A block of marble 5 m × 4 m × 2 m in size is cut into rectangular tiles of 1 m × 0.5 m size having thickness of 10 cm. Assuming 10% wastage in cutting, how many tiles will be made?
