Three types of rice flour, E, F and G come in containers of 200 g, 250 g and 350 g respectively. Containers of E, F and G are mixed together in the ratio 1 : 2 : 3 to obtain 12.25 kg of an assortment of rice flour.

1. How many containers of E and F are used altogether?
2. Find the difference between the combined weight of all the rice flour in containers F and containers G as compared to the rice flour in containers E. Express the weight in kilograms.

	E	F	G
Number	1 u	2 u	3 u
Value	200	250	350
Total value	200 u	500 u	1050 u

(a)
Total mass of rice flour
= 200 u + 500 u + 1050 u
= 1750 u

1750 u = 12250

1 u = 12250 ÷ 1750 = 7

Total number of containers of E and F used
= 1 u + 2 u
= 3 u
= 3 x 7
= 21 

(b)
Combined weight of all the rice flour in containers F and containers G
= 500 u + 1050 u
= 1550 u

Difference between the combined weight of all the rice flour in containers F and containers G as compared to the rice flour in containers E
= 1550 u - 200 u
= 1350 u
= 1350 x 7
= 9450 g
= 9.45 kg 

Answer(s): (a) 21; (b) 9.45 kg