The length of a rectangle is increased by $20\%$. By what percent would the width has to be decreased to maintain the same area? 

Which two signs should be interchanged to make the following equation correct?

$12 - 8 + 4 + 2 \times 8=4$

Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the equation.

$60*2*3*6*5*43$

By interchanging which two numbers, the equation will be correct?

$3 + 6 ÷ 2 \times 4 - 7 = 5$

If the given two numbers are interchanged, which of the following equations will become correct?

$3 \mathrm{and} 5$

Which two numbers need to be interchanged to make the following equation correct?

$5\times 8+7-3=14$