Adding and Subtracting Mixed Numbers: Very Difficult Problems with Solutions

[tex]2\frac{1}{9} + 1\frac{1}{6} + 3\frac{3}{5} - 2\frac{2}{3} = ? [/tex]

If you spend [tex]\frac{1}{4}[/tex] of your salary during the first week of the month and 20% of it during each of the coming 3 weeks, what part(fraction) of your salary will leave unspent at the end of the month?

A father bought fruits for the whole week. The family ate [tex]\frac{1}{8}[/tex] of the fruits per day during the first 4 days, and [tex]\frac{1}{6}[/tex] of the fruits every day till the end of the week. What part of the fruits did they leave for the next week?