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
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