Delhi SI CPO Nov 23 Shift-1

Two successive discounts, each of x% on the marked price of an article, are equal to a single discount of ₹331.20. If the marked price of the article is ₹920, then the value of x is:

If $$a^{2}+b^{2}+c^{2}+216=12(a+b-2c)$$, then $$\sqrt{ab-bc+ca}$$ is :

A is twice as good a workman as B and together they finish a piece of work in 13 days. In how many days will B alone finish the work?

Two pipes A and can fill a tank in 15 hours and 18 hours, respectively. Both pipes are opened simultaneously to fill the tank. In how many hours will the empty tank be filled

The given histogram shows the height of the students.

The number of students whose height is in the class interval 170-175 is what per cent less than the number of students whose height is in the interval 165-170? (correct to one decimal place)

Pipes A and B can fill a tank in 16 hours and 24 hours, respectively, whereas pipe C can empty the full tank in 40 hours. All three pipes are opened together, but pipe A is closed after 10 hours. After how many hours will the remaining part of the tank be filled?

If decreasing 110 by x% gives the same result as increasing 50 by x% , then x% of 650 is what percentage more than (x + 20) % of 180?

In a $$\triangle$$ ABC,the bisectors of $$\angle B $$ and $$\angle C$$ meet at O. If $$\angle BOC = 142^\circ$$, then the measure of $$\angle A$$ is:

A person was standing on a road near a mall. He was 1425 m away from the mall and able to see the top of the mall from the road in such a way that the top of a tree, which is in between him and the mall, was exactly in line of sight with the top of the mall. The tree height is 10 m and it is 30 m away from him. How tall (in m) is the mall?

Seven years ago, the ratio of the ages of A and B was4: 5. Eight years hence, the ratio of the ages of A and B will be 9 : 10. What is the sum of their present ages in years?