The average of 4 terms is 30 and the 1st term is $\frac{1}{3}$ of the sum of the remaining terms. What is the first term ?
Answer & explanation
Correct answer: option 2
Lets assume sum of last three terms be 3x
1st term = 3x × \(\frac{1}{3}\) = x
Sum of 4 terms = 120
x + 3x = 120
x = 30