Three types of rice flour, C, D and E come in containers of 120 g, 160 g and 240 g respectively. Containers of C, D and E are mixed together in the ratio 1 : 3 : 6 to obtain 24.48 kg of an assortment of rice flour.

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

	C	D	E
Number	1 u	3 u	6 u
Value	120	160	240
Total value	120 u	480 u	1440 u

(a)
Total mass of rice flour
= 120 u + 480 u + 1440 u
= 2040 u

2040 u = 24480

1 u = 24480 ÷ 2040 = 12

Total number of containers of C and D used
= 1 u + 3 u
= 4 u
= 4 x 12
= 48 

(b)
Combined weight of all the rice flour in containers D and containers E
= 480 u + 1440 u
= 1920 u

Difference between the combined weight of all the rice flour in containers D and containers E as compared to the rice flour in containers C
= 1920 u - 120 u
= 1800 u
= 1800 x 12
= 21600 g
= 21.6 kg 

Answer(s): (a) 48; (b) 21.6 kg