the tens digit of a two digit number is 4 times of its unit digit and the sum of the digits be 10 . then the first number is
let the number be 10 x + y according to the question x = 4 y x + y = 10 4 y + y = 10 or y = 2 and x = 8 so required number is = 10 * 8 + 2 = 82 answer : d
multiply(multiply(4, divide(10, add(const_1, 4))), const_10)