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Total number of students in school = 400 Let the number of Boys be ‘x. Then the number of girls in school = 400-x According to the question, x × 16 + (400 - x) × 12 = 400 × 14+9/12 16x + 4800 - 12x = 400 × 59/4 4x + 4800 = 5900 4x = 1100 x = 275 Number of girls = 400 - 275 = 125
Average of 8 numbers is 70. If average of first four and last two numbers is 80 and 45, respectively then find the fifth number given that ratio of fift...
The average age of A and B is 17 years. If A is to be replaced by C, the average would be 16 years. The average age of C and A is 18 years. Find the age...
The average mark obtained by 120 candidates in a certain examination is 50. If the average marks of passed candidates are 55 and that of the failed cand...
In a General store, the average cost of a Rice bag, Pulse bag and Sugar bag is Rs.600. The average cost of sugar bag and Pulse bag is Rs.650. What will ...
Out of 6 numbers, the sum of the first 5 numbers is 7 times the number. If their average is 136, then the 6th number is:
The average of the present age of 6 members of a family is 42 years. The present age of the youngest member is 12 years. Then what was the average age o...
The average of 30 numbers is 55. The average of the first 15 numbers is 50 and the average of the last 12 numbers is 55. What is the average of 68, 74 a...
The average of a set of 25 numbers is 98. For the first 14 numbers, the mean is 84, and for the last 8 numbers, the mean is 112. ...
In an examination the average marks of Rohit is 63. If he got 20 more marks in science and 28 more marks in maths then his average would have been 69. F...
The average weight of 30 students in a class increases by 0.5 kg when the weight of the principal is included. If earlier the average weight of the stud...
