Out of the five subjects, the average marks of Suman in first 3 Subjects was 81 and the average marks in the last 3 subjects was 74. If her…

Let the five subjects are a, b, c, d and e

Marks in third subject c = 65 given

Average marks in first three subjects = 81

⇒ (a + b + c)/3 = 81

⇒ a + b + c = 243

Average marks in last three subjects = 74

⇒ (c + d + e)/3 = 74

⇒ c + d + e = 222

⇒ 65 + d + e = 222

⇒ d + e = 222 – 65 = 157

Average marks of suman in all sub. = (a + b + c + d + e)/5 = (243 + 157)/5

∴ Average marks = 400/5 = 80

Let the five subjects are a, b, c, d and e

Marks in third subject c = 65 given

Average marks in first three subjects = 81

⇒ (a + b + c)/3 = 81

⇒ a + b + c = 243

Average marks in last three subjects = 74

⇒ (c + d + e)/3 = 74

⇒ c + d + e = 222

⇒ 65 + d + e = 222

⇒ d + e = 222 – 65 = 157

Average marks of suman in all sub. = (a + b + c + d + e)/5 = (243 + 157)/5

∴ Average marks = 400/5 = 80

Let the five subjects are a, b, c, d and e

Marks in third subject c = 65 given

Average marks in first three subjects = 81

⇒ (a + b + c)/3 = 81

⇒ a + b + c = 243

Average marks in last three subjects = 74

⇒ (c + d + e)/3 = 74

⇒ c + d + e = 222

⇒ 65 + d + e = 222

⇒ d + e = 222 – 65 = 157

Average marks of suman in all sub. = (a + b + c + d + e)/5 = (243 + 157)/5

∴ Average marks = 400/5 = 80