While travelling downstream, a man can row 16 km more in 4 hours as compared to travelling upstream. What is the speed of the stream?

From a solid cylinder whose height is 12 cm and diameter 10 cm a conical cavity of same height and same diameter of the base is hollowed out. The volume of the remaining solid is (cm³)approximately .Π=22/7

The age of Shipra can be obtained by subtracting three times her age 3 years ago from the three times her age after 3 years. What will her age after 2 years?

A trader bought 10 kg of apples for Rs. 405 out of which 1 kg of apples were found to be rotten. If he wishes to make a profit of 10 % at what rate should he sell the remaining apples per kg? 

If the income of Ram is $$ 12{1\over2}\%$$ more than that of Shyam, the income of Shyam is less than that of Ram by

Study the information carefully to answer the question that follow.

In a college there are 900 students who are doing Post Graduation (PG) in any one of the subjects, out of five different subjects, out of the five different subjects viz. Zoology, Botany, Mathematics, Physics and Statistics. The ratio between the boys and the girls among those is 5:4 respectively, 20% of the total girls are doing PG in Zoology and 25% of the total girls are doing PG in Statistics. Total number of students doing PG in Botany is 220. Total students who are doing PG in Mathematics is 150. Respectively ratio between the number of girls and the number of boys doing PG in statistics is 2:3. Twenty percent of the total number of boys are doing PG in Mathematics is 1:2 respectively. There are equal number of boys and girls who are doing PG in PG in Physics. 180 students are doing PG in Zoology.
Number of girls doing PG in Statistics is what percent of the number of boys doing PG in Physics?

If pq+qr+rp=0 then find the value of $$ {p^{2}\over {p^{2}-qr}}+{q^{2}\over {q^{2}-rp}}+{r^{2}\over {r^{2}-pq}}$$

Shankar took a loan of Rs. 25,000 for purchasing a machine. How much amount will he repay after 1 year 6 months at annual rate of 12%, when interest is accumulated annually?