Mixed numbers on the line; adding and subtracting fractions

What is $\tfrac{3}{5} + \tfrac{4}{5}$?

1. A$\tfrac{7}{10}$
2. B$\tfrac{1}{5}$
3. C$\tfrac{7}{5}$
4. D$\tfrac{12}{5}$

Which number is between 2 and 3 on a number line?

1. A$3\tfrac{1}{2}$
2. B$1\tfrac{3}{4}$
3. C$2\tfrac{1}{4}$
4. D$\tfrac{2}{3}$

A jug holds $2\tfrac{3}{4}$ litres of juice. Sam pours out $\tfrac{1}{4}$ of a litre. How many litres are left?

1. A$1\tfrac{2}{4}$
2. B$3$
3. C$\tfrac{2}{4}$
4. D$2\tfrac{2}{4}$