Question
120 is divided into two parts in such a way that the
sixth part of the first part and the seventh part of the second are in the ratio 5 : 6. How much percent second part is more than the first part?Solution
First part = x and second part = 120 – x ∴(x/6)/((120 - x)/7) = 5/6 ⇒x/6× 7/(120-x) = 5/6 ⇒ 42x = 720 × 5 - 30x ⇒ 72x = 3600 ⇒x = 50 ∴ the second part will be 120 – 50 = 70 Required percentage = (70-50)/50 ×100=40%
Average 20 numbers is ‘x’. If the average of first 12 numbers is 72.5 while average of last 5 numbers is 82.2 and 13th, 14th a...
The average of 8 numbers is 12. If the 2 is added in 1st number, 4 is added in 2nd number, 8 is added in 3rd number and in the same way the number are a...
- The average of 36 values is 92. What will be the average if every value is multiplied by 9?
There are five containers in a truck hold. The weight of the first container is 100 kg and the weight of the second container is 20% higher than the wei...
- The average of two numbers is 3 more than the smaller number among them. If the greater number is 25% more than the smaller number, then find the sum of th...
Find the mean of the following observations:
45, 54, 42, 56, 46, 48, 52, 50, 57, 43Find the average of the numbers 12, 14, 18 and 26
A batsman scores 87 runs in the 21st match of his career. His average runs per match increases by 2. What was his average before the 21st match.
5 positive numbers are written on a piece of paper. Sum of first 3 numbers is 60 and ratio of the 4th and the 5th number is 2:3. If difference between t...
Average age of A, B and C is 20 years. Average age of B and C was 12 years when A was born. If B is 21 years old, then, find the age of C, 6 years hence.
Relevant for Exams:
