Three types of chicken powder, P, Q and R come in containers of 160 g, 200 g and 240 g respectively. Containers of P, Q and R are mixed together in the ratio 2 : 3 : 4 to obtain 9.4 kg of an assortment of chicken powder.

1. How many containers of P and Q are used altogether?
2. Find the difference between the combined weight of all the chicken powder in containers Q and containers R as compared to the chicken powder in containers P. Express the weight in kilograms.

	P	Q	R
Number	2 u	3 u	4 u
Value	160	200	240
Total value	320 u	600 u	960 u

(a)
Total mass of chicken powder
= 320 u + 600 u + 960 u
= 1880 u

1880 u = 9400

1 u = 9400 ÷ 1880 = 5

Total number of containers of P and Q used
= 2 u + 3 u
= 5 u
= 5 x 5
= 25 

(b)
Combined weight of all the chicken powder in containers Q and containers R
= 600 u + 960 u
= 1560 u

Difference between the combined weight of all the chicken powder in containers Q and containers R as compared to the chicken powder in containers P
= 1560 u - 320 u
= 1240 u
= 1240 x 5
= 6200 g
= 6.2 kg 

Answer(s): (a) 25; (b) 6.2 kg