Three types of curry powder, S, T and U come in containers of 90 g, 180 g and 240 g respectively. Containers of S, T and U are mixed together in the ratio 2 : 3 : 6 to obtain 15.12 kg of an assortment of curry powder.

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

	S	T	U
Number	2 u	3 u	6 u
Value	90	180	240
Total value	180 u	540 u	1440 u

(a)
Total mass of curry powder
= 180 u + 540 u + 1440 u
= 2160 u

2160 u = 15120

1 u = 15120 ÷ 2160 = 7

Total number of containers of S and T used
= 2 u + 3 u
= 5 u
= 5 x 7
= 35 

(b)
Combined weight of all the curry powder in containers T and containers U
= 540 u + 1440 u
= 1980 u

Difference between the combined weight of all the curry powder in containers T and containers U as compared to the curry powder in containers S
= 1980 u - 180 u
= 1800 u
= 1800 x 7
= 12600 g
= 12.6 kg 

Answer(s): (a) 35; (b) 12.6 kg