C) Mary uses $$ \frac{3}{3} $$ itres of milk on a Wednesday, $$ 1 \frac{3}{4} $$ litres on a Thursday, and $$ \frac{2}{5} $$ litres of milk on a Friday. (i) How much mik did Mary use on these three $$ d $$ (ii) If she had three 2-litre botties in the fridge, how much milk would she have left over?

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Let the amount of milk Mary uses on each day be as follows:

- Wednesday: $$ \frac{3}{3} $$ litres (which is $$1$$ litre)
- Thursday: $$ 1 \frac{3}{4} = \frac{7}{4} $$ litres
- Friday: $$ \frac{2}{5} $$ litres

### (i) Total Milk Used

1. Write the three amounts:
   - $$ 1 = \frac{1}{1} $$ (but we'll convert it to a fraction with common denominator later)
   - $$ \frac{7}{4} $$
   - $$ \frac{2}{5} $$

2. To add the fractions, find a common denominator. The denominators are $$1$$, $$4$$, and $$5$$. The LCM of $$1$$, $$4$$, and $$5$$ is $$20$$.

3. Express each quantity with denominator $$20$$:
   - For $$1$$ litre:
     $$
     1 = \frac{1 \times 20}{1 \times 20} = \frac{20}{20}
     $$
   - For $$\frac{7}{4}$$:
     $$
     \frac{7}{4} = \frac{7 \times 5}{4 \times 5} = \frac{35}{20}
     $$
   - For $$\frac{2}{5}$$:
     $$
     \frac{2}{5} = \frac{2 \times 4}{5 \times 4} = \frac{8}{20}
     $$

4. Now, add the fractions:
   $$
   \text{Total} = \frac{20}{20} + \frac{35}{20} + \frac{8}{20} = \frac{20 + 35 + 8}{20} = \frac{63}{20}
   $$

5. Converting $$\frac{63}{20}$$ to a mixed number:
   $$
   \frac{63}{20} = 3 \frac{3}{20}
   $$
   
Thus, Mary used a total of $$ \frac{63}{20} $$ litres (or $$ 3 \frac{3}{20} $$ litres) of milk over these three days.

### (ii) Milk Left Over

1. Mary had three $$2$$-litre bottles, so the total amount of milk available was:
   $$
   3 \times 2 = 6 \text{ litres}
   $$

2. Subtract the total used from the total available:
   $$
   \text{Milk left} = 6 - \frac{63}{20}
   $$

3. Express $$6$$ with denominator $$20$$:
   $$
   6 = \frac{6 \times 20}{20} = \frac{120}{20}
   $$

4. Now, perform the subtraction:
   $$
   \text{Milk left} = \frac{120}{20} - \frac{63}{20} = \frac{120 - 63}{20} = \frac{57}{20}
   $$

5. Converting $$\frac{57}{20}$$ to a mixed number:
   $$
   \frac{57}{20} = 2 \frac{17}{20}
   $$

So, Mary would have $$ \frac{57}{20} $$ litres (or $$ 2 \frac{17}{20} $$ litres) of milk left over.

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**Final Answers:**

(i) Total milk used: $$ \frac{63}{20} $$ litres (or $$ 3 \frac{3}{20} $$ litres)

(ii) Milk left over: $$ \frac{57}{20} $$ litres (or $$ 2 \frac{17}{20} $$ litres)
Mary used a total of $$ \frac{63}{20} $$ litres (or $$ 3 \frac{3}{20} $$ litres) of milk over Wednesday, Thursday, and Friday. After using this amount, she has $$ \frac{57}{20} $$ litres (or $$ 2 \frac{17}{20} $$ litres) of milk left over from her three 2-litre bottles.

C) Mary uses \( \frac{3}{3} \) itres of milk on a Wednesday, \( 1 \frac{3}{4} \) litres on a Thursday, and \( \frac{2}{5} \) litres of milk on a Friday. (i) How much mik did Mary use on these three \( d \) (ii) If she had three 2-litre botties in the fridge, how much milk would she have left over?

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