7 liters of a 22 percent solution of alcohol in water are mixed with 3 liters of an 11 percent alcohol in water solution . what is the percentage of alcohol in the new solution ?
"the total amount of alcohol is 0.22 ( 7 ) + 0.11 ( 3 ) = 1.87 liters . the percentage is 1.87 / 10 = 18.7 / 100 which is 18.7 % the answer is e ."
multiply(divide(add(multiply(7, divide(22, const_100)), multiply(divide(11, const_100), multiply(7, divide(22, const_100)))), add(7, const_2.0)), const_100)