If the average of a and b is 45 and the average of b and c is 35, then (a – c)=?
Solution
Correct Answer: Option C
প্রশ্নে বলা হচ্ছে, a ও b গড় 45 এবং b ও c এর গড় 35 হলে (a - c) = ?
দেয়া আছে, (a + b)/2 =45
⇒ a + b = 90
∴ b = 90 - a
আবার, (b + c)/2 = 35
⇒ b + c = 70
⇒ 90 - a + c = 70
⇒ - a + c = -20
⇒ a - c = 20
∴ a - c = 20
দেয়া আছে, (a + b)/2 =45
⇒ a + b = 90
∴ b = 90 - a
আবার, (b + c)/2 = 35
⇒ b + c = 70
⇒ 90 - a + c = 70
⇒ - a + c = -20
⇒ a - c = 20
∴ a - c = 20
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