1.

The average of six numbers is 20. If one number is removed, the average becomes 15. What is the number removed?1). 52). 353). 1124). 45

Answer»

Given, AVERAGE of 6 NUMBERS = 20

∴ Sum of 6 numbers = Average × 6 = 20 × 6 = 120

Let, a number ‘X’ is removed.

∴ Sum of remaining 5 numbers = 120 – x

Average of remaining 5 numbers

= Sum of remaining 5 numbers/5

= (120 – x)/5

According to the question,

Average of remaining 5 numbers = 15

∴ (120 – x)/5 = 15

⇒ 120 – x = 75

⇒ x = 45


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