a man spends 2 / 5 of his salary on house rent , 3 / 10 of his salary on food and 1 / 8 of his salary on conveyance . if he has $ 1400 left with him , find his expenditure on food .
"part of salary left = 1 - ( 2 / 5 + 3 / 10 + 1 / 8 ) = 7 / 40 let the monthly salary be $ x then ( 7 / 40 ) of x = 1400 x = 8000 expenditure on food = $ 2400 option d"
add(multiply(divide(1400, subtract(1, add(add(divide(2, 5), divide(3, 10)), divide(1, 8)))), divide(3, 10)), multiply(divide(1400, subtract(1, add(add(divide(2, 5), divide(3, 10)), divide(1, 8)))), divide(1, 8)))