Three types of curry powder, U, V and W come in containers of 80 g, 200 g and 280 g respectively. Containers of U, V and W are mixed together in the ratio 1 : 3 : 4 to obtain 19.8 kg of an assortment of curry powder.

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

	U	V	W
Number	1 u	3 u	4 u
Value	80	200	280
Total value	80 u	600 u	1120 u

(a)
Total mass of curry powder
= 80 u + 600 u + 1120 u
= 1800 u

1800 u = 19800

1 u = 19800 ÷ 1800 = 11

Total number of containers of U and V used
= 1 u + 3 u
= 4 u
= 4 x 11
= 44 

(b)
Combined weight of all the curry powder in containers V and containers W
= 600 u + 1120 u
= 1720 u

Difference between the combined weight of all the curry powder in containers V and containers W as compared to the curry powder in containers U
= 1720 u - 80 u
= 1640 u
= 1640 x 11
= 18040 g
= 18.04 kg 

Answer(s): (a) 44; (b) 18.04 kg