MCA Exam Numerical Ability Permutation and Combination

in what proportion must rice that costs Rs.20/kg be mixed with rice that costs Rs.25/kg so that the mixture is worth Rs.22/kg

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MCA Other Question

A teacher gave a student the task of adding ā€˜Nā€™ natural numbers starting from 1. After a while, the student reported his result as 700. The teacher replied that his result was wrong. The student realized that
he had added one number twice by mistake. Find the sum of the digits of the number which the student had added twice.
In an examination,a student gets 5 marks for every right answer and loses 2 marks for every wrong answer.If he answers 50 questions and get 124 marks, how many are correct answers he attempted?