A vendor sells potatoes at a cost price, but he mixes some rotten potatoes and thereby gains 25%. The percentage of rotten potatoes in the mixture is? 

In a school, if there are 36% boys and 352 girls, then the number of boys is ________.

If double the age of the daughter is added to the age of her mother, the sum is 70 and if double the age of mother is added to the age of the daughter, the sum is 95. The respective ages of daughter and mother (in years) are:

The present age of A and B are in the ratio 5: 4. After 10 years the ratio becomes 7: 6. Find the present age of A.

A secant PAB is drawn from an external point P to the circle with centre O, intersecting it at A and B. If OP = 17 cm, PA = 12 cm and PB = 22.5 cm, then the radius of the circle is:

Salim's age is 10 years. His grandfather's age is 62 years. After how many years will his grandfather's age be five times that of Salim?

Directions : Study the following frequency polygon and answer the questions. Given a line graph showing the number of students passed in Higher Secondary Examination in a school over the years 2008 to 2013.

The decrease in percentage of passed students from 2011 to 2012 approximately is 

In ΔPQR, PQ=QR and O is an interior point of ΔPQR such that ∠OPR=∠ORP.

Consider the following statements:

(i) ΔPOR is an isosceles triangle.

(ii) O is the centroid of ΔPQR.

(iii) ΔPQO is congruent to ΔRQO.

Which of the above statements are correct?