Three types of bread flour, D, E and F come in containers of 80 g, 200 g and 280 g respectively. Containers of D, E and F are mixed together in the ratio 1 : 2 : 5 to obtain 9.4 kg of an assortment of bread flour.

1. How many containers of D and E are used altogether?
2. Find the difference between the combined weight of all the bread flour in containers E and containers F as compared to the bread flour in containers D. Express the weight in kilograms.

	D	E	F
Number	1 u	2 u	5 u
Value	80	200	280
Total value	80 u	400 u	1400 u

(a)
Total mass of bread flour
= 80 u + 400 u + 1400 u
= 1880 u

1880 u = 9400

1 u = 9400 ÷ 1880 = 5

Total number of containers of D and E used
= 1 u + 2 u
= 3 u
= 3 x 5
= 15 

(b)
Combined weight of all the bread flour in containers E and containers F
= 400 u + 1400 u
= 1800 u

Difference between the combined weight of all the bread flour in containers E and containers F as compared to the bread flour in containers D
= 1800 u - 80 u
= 1720 u
= 1720 x 5
= 8600 g
= 8.6 kg 

Answer(s): (a) 15; (b) 8.6 kg