Let the numbers be x, x + 2, x + 4, x + 6, and x + 8Avg = x + x + 2 + x + 4 + x + 6 + x + 8/5 = 40Therefore, 5x + 20 = 200Therefore, x = 180/5 = 36Therefore, r = x + 4 = 40 s = x + 6 = 42Therefore, Product = 1680
Let the ten's digit be x and unit's digit by yThen, x + y = 15 and x - y = 3 or y - x = 3Solving x + y = 15 and x - y = 3, we get: x = 9, y = 6Solving x + y = 15 and y - x = 3, we get: x = 6, y = 9So, the number is either 96 or 69.Hence, the number cannot be determined.
Let the number be 10x + y.Therefore, x + y = 9 ..................(i)10x + y - (10y + x) = 4510x + y - 10y - x = 45Therefore, x - y = 5 ..................(ii)From (i) and (ii), x = 7, y = 2Number = 72Therefore, = x x y = 7 x 2 = 14
EXAMIANS