30 is to be divided into two parts such that the sum of 10 times the first and 22 times the second is 780 . the bigger part is :
"explanation : let the two parts be ( 30 - x ) and x . then , 10 ( 30 - x ) + 22 x = 780 = > 12 x = 480 = > x = 40 . bigger part = ( 30 - x ) = 10 . answer : d ) 10"
subtract(30, divide(subtract(780, multiply(30, 10)), subtract(22, 10)))