The average of $T_{1}$ and $T_{2}$ is 15. The average of $T_{3}$ and $T_{4}$ is 35. What is the average of $T_{1}, T_{2}, T_{3}$ and $T_{4}$ ?
Answer & explanation
Correct answer: option 4
Sum of $T_{1}$ and $T_{2}$ = 2 × 15 = 30
Sum of $T_{3}$ and $T_{4}$ = 2 × 35 = 70
Average of $T_{1}, T_{2}, T_{3}$ and $T_{4}$ = \(\frac{100}{4}\)
= 25