Question : The average of T1 and T2 is 15. The average of T3 and T4 is 35. What is the average of T1, T2, T3, and T4?
Option 1: 24
Option 2: 30
Option 3: 28
Option 4: 25
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Correct Answer: 25
Solution : Given that the average of T 1 and T 2 is 15, the sum of T 1 and T 2 is 15 × 2 = 30 Similarly, given that the average of T 3 and T 4 is 35, the sum of T 3 and T 4 is 35 × 2 = 70 So, the sum of T1, T2, T3, and T4 is 30 + 70 = 100 Since there are 4 numbers, the average of these 4 numbers is $\frac{100}{4}$ = 25 Hence, the correct answer is 25.
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