840

12.3

60

if 30% = 60, then 10% = 20 (divide by 3)

and,

if 10% = 20, then 100% = 200 (multiply by 10).

2) A because:

if 80% = 40, then 10% = 5 (divide by 8)

and,

if 10% = 5, then 100% = 50 (multiply by 10).

3) D because:

if 10% of 65 = 6.5, then 20% of 65 = 13 (multiply by 2).

b) 0.9L =900ml Answer is 901ml or 0.901L

c) 4.2L=4,200ml Answer is 4,330ml or 4.33L

2. 46

3. 2.15kg or 2150g

4. 6 bags

5. Teddy: 4,500 m or 4.5 km

   Annie: 3,150 m or 3.15 km

   Total: 13,050 m or 13.05 km

6. a)See picture

7. b) 40