In an examination, 80% of the students passed in English, 85% in Mathematics and 75 % in both English and
Mathematics. If 40 students failed in both the subjects , find the total number of students.
In an examination 35% of total students failed in Hindi , 45% failed English and 20% in both .Find the percentage of
those who passed in both the subjects .
Due to a reduction of `6 1/4`% in the price of sugar , a man is able to buy 1 kg more for Rs. 120. Find the original and reduced rate of sugar .
How many kg of pure salt must be added to 30kg of 2% solution of salt and water to increase it to a 10% solution ?
If A's salary is 20% less than B's salary, by how much percent is B's salary more than A's