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Out of 5 numbers, the sum of the first 4 numbers is 10 times the 5th number. If their average is 121 then the 5th number is? |
55 76 64 45 |
55 |
Let 5th number = x Sum of 4 numbers = 10x \(\frac{10x + x}{5}\) = 121 11 x = 121 × 5 x = 55 |
