Question
2n years ago, the age of Rahul was four times that of
his son and n years ago, the age of Rahul was thrice that of his son. If n years later, the sum of the ages of Rahul and his son will be 80 years, then the difference in the ages of Rahul and his son is –Solution
Let the present ages of Rahul and his son be x and y respectively. 2n years ago, => x – 2n = 4(y – 2n) => x = 4y – 6n ------ (i) n years ago, => x - n = 3(y – n) => x = 3y – 2n ------ (ii) Solving (i) and (ii) we get, => y = 4n => x = 4 × 4n – 6n = 10n Now n years later, => x + n + y + n = 80 => 4n + n + 10n + n = 80 => 16n = 80 => n = 5 Required difference = 10n – 4n = 6n = 30 years
What is a defining characteristic of big data compared to traditional data?
Which of the following best explains why sampling is used in data analysis?
Which of the following methods is used to ensure stationarity in time series data, a critical prerequisite for ARIMA modeling?
Which of the following is an example of semi-structured data?
How can selection bias be minimized in a survey of employee job satisfaction?
Which type of malware is designed to replicate itself without user intervention and spread across networks, often causing widespread disruption?
Which of the following methods is most effective in reducing selection bias during the sampling process?
What is the primary difference between recursion and iteration in programming?
In Python, which of the following functions in the Pandas library is used to merge two DataFrames df1 and df2 on a common column id?
Which SDLC model integrates testing at every phase of development, ensuring defects are identified early?
Relevant for Exams:
