there is food for 760 men for 22 days . how many more men should join after two days so that the same food may last for 19 days more ?
"760 - - - - 22 760 - - - - 20 x - - - - - 19 x * 19 = 760 * 20 x = 800 760 - - - - - - - 40 answer : b"
subtract(divide(multiply(760, subtract(22, const_2)), 19), 760)