Three types of chicken powder, Q, R and S come in containers of 240 g, 420 g and 600 g respectively. Containers of Q, R and S are mixed together in the ratio 1 : 3 : 6 to obtain 61.2 kg of an assortment of chicken powder.

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

	Q	R	S
Number	1 u	3 u	6 u
Value	240	420	600
Total value	240 u	1260 u	3600 u

(a)
Total mass of chicken powder
= 240 u + 1260 u + 3600 u
= 5100 u

5100 u = 61200

1 u = 61200 ÷ 5100 = 12

Total number of containers of Q and R used
= 1 u + 3 u
= 4 u
= 4 x 12
= 48 

(b)
Combined weight of all the chicken powder in containers R and containers S
= 1260 u + 3600 u
= 4860 u

Difference between the combined weight of all the chicken powder in containers R and containers S as compared to the chicken powder in containers Q
= 4860 u - 240 u
= 4620 u
= 4620 x 12
= 55440 g
= 55.44 kg 

Answer(s): (a) 48; (b) 55.44 kg