Three types of flour, R, S and T come in containers of 80 g, 160 g and 200 g respectively. Containers of R, S and T are mixed together in the ratio 1 : 4 : 6 to obtain 15.36 kg of an assortment of flour.

1. How many containers of R and S are used altogether?
2. Find the difference between the combined weight of all the flour in containers S and containers T as compared to the flour in containers R. Express the weight in kilograms.

	R	S	T
Number	1 u	4 u	6 u
Value	80	160	200
Total value	80 u	640 u	1200 u

(a)
Total mass of flour
= 80 u + 640 u + 1200 u
= 1920 u

1920 u = 15360

1 u = 15360 ÷ 1920 = 8

Total number of containers of R and S used
= 1 u + 4 u
= 5 u
= 5 x 8
= 40 

(b)
Combined weight of all the flour in containers S and containers T
= 640 u + 1200 u
= 1840 u

Difference between the combined weight of all the flour in containers S and containers T as compared to the flour in containers R
= 1840 u - 80 u
= 1760 u
= 1760 x 8
= 14080 g
= 14.08 kg 

Answer(s): (a) 40; (b) 14.08 kg