The average age of a husband and wife, who were married 4 years ago, was 25 years at the time of their marriage. The average age of the family consisting of husband, wife and a child, born during the interval is 20 years today. The age of the child is:

If a + b + c = 6, a³ + b³+c³-3abc=342, then what is the value of ab + bc + ca?

Directions : The Bar Graph given here shows the population (in crores) of India in various census years. Observe the graph and answer the question based on it.

The per cent increase in population from 1971 to 1981 is

Directions: Study the following bar graph carefully to answer the questions.

The yield per acre of India is what percent more than that of Pakistan?

In an examination, 45% of all the students who appeared are boys and the rest are girls. If 60% of the boys and 70% of the girls passed, then what is the percentage of students who failed?

Find the average of 1.11, 0.01, 0.101, 0.001, 0.11

Directions: Student’s strength of a college in Arts, Science and Commerce from 2004-05 to 2007- 08 sessions are shown in the following bar graph. Study the graph and answer the questions

The ratio of average number of students in Arts to the average number of students in Commerce is

If x + y + 3 = 0 , then find the value of x³+y³-9xy+9.