$A, B, C$ and $D$ are four consecutive odd numbers and their average is $42 .$ What is the product of $B$ and $D$ ?

The average weight of $8$ sailors in a boat is increased by $1\, kg$ if one of them weighting $56\,kg$ is replaced by a new sailor. The weight of the new sailor is (in $kg$)

The average of $50$ numbers is $38 .$ If two numbers, namely $45$ and $55$ are discarded, the average of the remaining numbers is

Out of four numbers the average of the first three is $16$ and that of the last three is $15 .$ If the last number is $20$ then the first number is

The average of consecutive numbers is $n .$ If the next two consecutive numbers are also included, the average of the five numbers will

Find the average of the following set of scores $253,124,255,534,836,375,101,443,760$