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If 25a + 25b = 115, what is the average of a and b?

A. 2.5

B. 3.4

C. 4.5

D. 4.6

E. None of these

Answer: Option E

Solution(By Examveda Team)

25a + 25b = 115
⇒ 25 (a + b) = 115
⇒ a + b = $$\frac{115}{25}$$
⇒ a + b = $$\frac{23}{5}$$
∴ Average of a and b
= $$\frac{a + b}{2}$$
= $$\frac{23}{5}$$ × $$\frac{1}{2}$$
= $$\frac{23}{10}$$
= 2.3

This Question Belongs to Arithmetic Ability >> Average

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