Question

.Find two sets of 6 numbers with average 60 , satisfying each of the
conditions below;
a) Four of the numbers are less than 60 and two of them greater than 60
b) Four of the numbers are greater than 60 and two of them less than 60​

Answer 1

Answer:Take the last digit, double it, and subtract it from the rest of the number, if the answer is divisible by 7 (including 0), then the number is divisible by 7.

For example, let's check whether 1,519 is divisible by 7: 151-2*9=133. Since 133 is divisible by 7 (133=7*19), then so it is 1