3 numbers are in the ratio 4 : 5 : 6 and their average is 20 . the largest number is :
explanation : let the numbers be 4 x , 5 x and 6 x . therefore , ( 4 x + 5 x + 6 x ) / 3 = 20 15 x = 60 x = 4 largest number = 6 x = 24 . answer a
multiply(divide(20, divide(add(add(4, 5), 6), 3)), 6)