The average age of group of 20 girls is 15 years and that of...

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is :

Course Name: Quantitative Aptitude

1] 19.5 yearas
2] 20 years
3] 21 yearas
4] 21.5 years

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1 Discuss	The average weight of A, B and C is 40 kgs. Weight of C is 24 kgs more than A’s weight and 3 kgs less than B’s weight. What will be the average weight of A, B, C and D, if D weights 15 kgs less than C? 1] 42 kgs 2] 40 kgs 3] 36 kgs 4] 38 kgs Solution
10 Discuss	a, b, c, d, e, f, g are consecutive even numbers. j, k, l, m, n are consecutive odd numbers. The average of all the numbers is : 1] $3\left( {\frac{{a + n}}{2}} \right)$ 2] $\left( {\frac{{1 + d}}{2}} \right)$ 3] $\left( {\frac{{a + b + m + n}}{4}} \right)$ 4] $3\left( {\frac{{j + c + n +g}}{4}} \right)$ Solution
2 Discuss	There are 30 students in a class. The average age of first 10 students is 12.5 years. The average age of the remaining 20 students is 13.1 years. The average age (in years) of the students of the whole class is : 1] 12.5 years 2] 12.7 years 3] 12.8 years 4] 12.9 years Solution
3 Discuss	In an exam, the average marks obtained by Jhon in English, Math, Hindi and Drawing were 50. His average mark in Maths, Science, Social Studies and Craft were 70. If the average mark in all seven subjects is 58, his score in Maths was - 1] 50 2] 52 3] 60 4] 74 Solution
4 Discuss	The average price of 10 books is Rs.12 while the average price of 8 of these books is Rs.11.75. Of the remaining two books, if the price of one book is 60% more than the price of the other, what is the price of each of these two books? 1] Rs. 5, Rs.7.50 2] Rs. 8, Rs. 12 3] Rs. 16, Rs. 10 4] Rs. 12, Rs. 14 Solution
5 Discuss	What is the average of the first six (positive) odd number each of which is divisible by 7? 1] 42 2] 43 3] 47 4] 49 Solution
6 Discuss	If the arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is : 1] 10 2] 12 3] 14 4] 16 Solution
7 Discuss	A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning. 1] 40 2] 39 3] 52 4] 55 Solution
8 Discuss	The average of the ages of Sumit, Krishna and Rishabh is 43 and the average of the ages of Sumit, Rishabh and Rohit is 49. If Rohit is 54 years old, what is Krishna’s age? 1] 24 years 2] 36 years 3] 45 years 4] Cannot be determined 5] None of these Solution
9 Discuss	A passenger travels from Delhi to Merut at a speed of 30 kmph and return with a speed of 60 kmph. What is the average speed? 1] 40 2] 45 3] 50 4] 48 Solution
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