Question : The average of the first three numbers is double the fourth number. If the average of all the four numbers is 12. Find the 4th number.
Option 1: $16$
Option 2: $\frac{48}{7}$
Option 3: $20$
Option 4: $\frac{18}{7}$
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: $\frac{48}{7}$
Solution : Let the four numbers be $p, q, r$ and $s$. $⇒\frac{p+q+ r+s}{4}=12$ $⇒p+q+r+s=48$ ...(i) $⇒\frac{p+q+r}{3}=2s$ $⇒p+q+r=6s$ ...(ii) Putting equation (ii) in equation (i), we get, $⇒6s+s=48$ $⇒7s=48$ $\therefore s=\frac{48}{7}$ Hence, the correct answer is $\frac{48}{7}$.
Candidates can download this ebook to know all about SSC CGL.
Admit Card | Eligibility | Application | Selection Process | Preparation Tips | Result | Answer Key
Question : Of the 3 numbers whose average is 22, the first is $(\frac{3}{8 })^{th}$ of the sum of the other 2. What is the first number?
Question : The average age of 7 students in a class is 28 years. The average age of the first three students is 30 years. The age of the fourth student is 4 years less than the age of the fifth student. The ages of the last two students are the same and are 5 more than the average age of
Question : The average of 8 numbers is 18. If one of the numbers is excluded, the average becomes 20. Find the excluded number.
Question : The average of five positive numbers is 56. If the first number is three-fourths of the sum of the last four numbers, then the average of the last four numbers is:
Question : The sum of three consecutive even numbers is 28 more than the average of these three numbers. Then the smallest of these three numbers is:
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile