Open https://moodle.iitd.ac.in/login/index.php Copy paste the code in the console.

moodle_captcha

var field = document.getElementById('valuepkg3');
var condition = field.previousSibling.textContent;
var numbers = condition.match(/\d+/g).map(Number);
var myInt = 0;
if(condition.includes('first')){
	myInt = numbers[0];
}
else if(condition.includes('add')){
	myInt = numbers[0]+numbers[1];
}
else if(condition.includes('second')){
	myInt = numbers[1];
}
else if(condition.includes('subtract')){
	myInt = numbers[0] - numbers[1];
}
	field.value = myInt;