var inputArray = [
  { subject: 'Maths', marks: '40', noOfStudents: '5' },
  { subject: 'Science', marks: '50', noOfStudents: '16' },
  { subject: 'History', marks: '35', noOfStudents: '23' },
  { subject: 'Science', marks: '65', noOfStudents: '2' },
  { subject: 'Maths', marks: '30', noOfStudents: '12' },
  { subject: 'History', marks: '55', noOfStudents: '20' }
];

var factorArray = [
  { subject: 'History', marks: '500', noOfStudents: '200' },
  { subject: 'Maths', marks: '200', noOfStudents: '150' },
  { subject: 'Science', marks: '300', noOfStudents: '100' }
];

var outputArray = [
    { subject: 'Science', marks: '300-(50+65)', noOfStudents: '100-(16+2)' },
    { subject: 'Maths', marks: '200-(40+30)', noOfStudents: '150-(5+12)' },
    { subject: 'History', marks: '500-(35+55)', noOfStudents: '200-(23+20)' }
 ];