Two containers have acid and water mixed in the ratio 3:1 and 5:3 respectively. To get a new mixture with ratio of acid to water as 2:1, the two types of mixture have to be mixed in the ratio?

A The cost of building a fence around a circular field is ₹7,425 at the rate of 13.50 per foot. What is the area of the circular field? [use $$π={22\over 7}$$]

A circular grass field of diameter 42 m is surrounded by a path of width 3.5 m. What will be the cost of graveling the path at the rate ₹ 4 square meter?

The minute hand of a clock is 20 cm long. Find the area on the face of the clock swept by the minute hand between 8 a.m. and 8:45 a.m.

What approximate value should come in the place of question mark (?) in the following question?

2549.99 - [509.99 - {269.97 - (89.9 - 79.9 + 69.9)}] = ?

A kite in the shape of a square with a diagonal 32 cm attached to an equilateral triangle of the base 8 cm. Approximately how much paper has been used to make it? (Use √3 = 1.732)

The table below gives the ranks secured by five different students in three different subjects in a qualifying examination:

Find the positive difference between the ranks secured by A in Physics and in Maths.

A sum invested at compound inrerest amounts to ₹7,800 in 3 years and ₹11,232 in 5 years. What is the rate per cent?