Question
The average of 16 numbers is 20. The average of 1st 7
numbers is 15 and the average of the last 7 numbers is 25. The 8th number is 16 more than the 9th number. What is the value of the 8th and 9th numbers?Solution
Let the 8th and 9th numbers be x and y respectively. Sum of 16 number = 16 × 20 = 320 Sum of first 7 number = 7 × 15 = 105 Sum of last 7 number = 7 × 25 = 175 ATQ: x + y = 320 - 105 - 175 x + y = 40 We know that: x = 16 + y so, 16 + y + y = 40 2y = 40 - 16 = 24 y = 12 then, x = 16 + 12 = 28
Who lives immediately above the floor on which Usha lives?
What is the age of the person who works for Hdfc?
How many persons visits after the one who visits Mumbai?
Who among the following likes Montblanc?
Who among the following person lives immediate above flat of G?
Who among the following person lives in flat 2 of floor 4?
There are six teachers in school, viz. Bhanu, Raghav, Abdul, Shekhar, Kunal and Devesh. Since a ch of the there is no games teacher in the school, each...
How many persons live between E and D?
Who among the Following has Yellow colour?
Who among the following got the lowest marks?
Relevant for Exams:
