the ratio of number of boys and girls in a school is 2 : 5 . if there are 420 students in the school , find the number of girls in the school ?
"let the number of boys and girls be 2 x and 5 x total students = 420 number of girls in the school = 5 * 420 / 7 = 300 answer is c"
multiply(divide(420, const_3), const_2.0)