Comparing, ordering and converting fractions, decimals and percentages：练习题

Calculate the total cost of \(3\) pens if each pen costs \( \$4.2 \).

A large bottle of water contains \(1.5\) liters. If Peter drinks \(\frac{1}{3}\) of the water and then spills \(0.2\) liters, how many liters are left in the bottle?

Evaluate the following expression: \(12.5 - 3.2 \times (1.5 + 0.5) \div 0.4\).

Evaluate the following expression:
\( 7.2 + 3 \frac{1}{2} \times 0.8 \)

Solve for the expression: \(4.8 \div (0.2 + 0.6) \times 0.5\).

Evaluate the expression:
\( 0.6 \times 1\frac{1}{2} + 0.1 \)

A rectangular rug is \(1.5\) meters wide and \(2\frac{1}{4}\) meters long. What is the area of the rug in square meters?

A cyclist travels \( 18.6 \) km in the first hour and \( \frac{3}{4} \) of that distance in the second hour. What is the total distance covered in two hours?