exam Maths Puzzle Numerical Ability

which of the following CANNOT be the average ( arithmetic mean) of four positive even integers

A)1
B)2
C)6
D)9
E)12

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exam Other Question
how do you write 31.3 x 10^6 in standard notation? Write the following as a common fraction or mixed number. Write your answer in the lowest terms. 6.38


Find the decimal equivalent of the mixed number 11 1/4



Write in decimal form 481
1,000