Three types of rice flour, V, W and X come in containers of 120 g, 160 g and 200 g respectively. Containers of V, W and X are mixed together in the ratio 2 : 3 : 6 to obtain 13.44 kg of an assortment of rice flour.

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

	V	W	X
Number	2 u	3 u	6 u
Value	120	160	200
Total value	240 u	480 u	1200 u

(a)
Total mass of rice flour
= 240 u + 480 u + 1200 u
= 1920 u

1920 u = 13440

1 u = 13440 ÷ 1920 = 7

Total number of containers of V and W used
= 2 u + 3 u
= 5 u
= 5 x 7
= 35 

(b)
Combined weight of all the rice flour in containers W and containers X
= 480 u + 1200 u
= 1680 u

Difference between the combined weight of all the rice flour in containers W and containers X as compared to the rice flour in containers V
= 1680 u - 240 u
= 1440 u
= 1440 x 7
= 10080 g
= 10.08 kg 

Answer(s): (a) 35; (b) 10.08 kg