Three types of chicken powder, P, Q and R come in containers of 180 g, 240 g and 360 g respectively. Containers of P, Q and R are mixed together in the ratio 2 : 3 : 4 to obtain 30.24 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	180	240	360
Total value	360 u	720 u	1440 u

(a)
Total mass of chicken powder
= 360 u + 720 u + 1440 u
= 2520 u

2520 u = 30240

1 u = 30240 ÷ 2520 = 12

Total number of containers of P and Q used
= 2 u + 3 u
= 5 u
= 5 x 12
= 60 

(b)
Combined weight of all the chicken powder in containers Q and containers R
= 720 u + 1440 u
= 2160 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
= 2160 u - 360 u
= 1800 u
= 1800 x 12
= 21600 g
= 21.6 kg 

Answer(s): (a) 60; (b) 21.6 kg