alearned123 alearned123

14-02-2018
Mathematics

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The average of the first 8 numbers is 6. The average of the next 12 is 11. What is the overall average of the 20 numbers?

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wolf1728 wolf1728

14-02-2018

x / 8 = 6
x = 48

y / 12 = 11
y = 132

Total of the 20 numbers = 48 + 132 = 180
Average of these 20 = 180 / 20
= 9

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A two-digit number is obtained by either multiplying the sum of the digits by 8 and adding 1 or by multiplying the difference of the digits by 13 and adding 2.