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Question 1:

What is the fourth proportional to 15,12 and 20 .

Question 2:

In a 54 litres mixture of milk and water, the ratio of milk to water is $2: 1$. when some quantity of water is added to the mixture this ratio becomes $1: 2$ The quantity of water added is:

Question 3:

A sphere of radius $9 \mathrm{~cm}$ is moulded to form a cylinder of radius $3 \mathrm{~cm}$. Find the height of the cylinder.

Question 4:

A can do $25 \%$ of a work in 12 days, B can do $\frac{2}{5}$ of the same work in 8 days. Working together they can do $85 \%$ of the same work in ___ Days.

Question 5:

A man travelled four equal distances of $3 \mathrm{~km}$ at speeds of $10,20,30$ and $40 \mathrm{~km} / \mathrm{hr}$ respectively. What is his average speed (in $\mathrm{km} / \mathrm{hr}$ )?

Question 6:

The value of $\frac{(0.06)^{2}-(0.02)^{2}}{0.06-0.02}$ is:

Question 7:

A shopkeeper marks the marked price of an article 30 % more than its real price and offers 10 % discount. What is the gain percentage?

Question 8:

In an examination, a student requires $35 \%$ marks to pass. If Sunita gets 145 marks and fails by 23 marks, then what are the maximum marks of the examination?

Question 9:

$\frac {5}{ 6}$ of a number is 655 , find $\frac {9}{ 20}$ of the same number.

Question 10:

The average age of a husband and his wife 3 years ago was 39 years. The average age of the husband, wife and their child 2 years hence will be 34 years. Find the present age of the child.