Three types of curry powder, M, N and P come in containers of 90 g, 150 g and 210 g respectively. Containers of M, N and P are mixed together in the ratio 2 : 4 : 7 to obtain 20.25 kg of an assortment of curry powder.

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

	M	N	P
Number	2 u	4 u	7 u
Value	90	150	210
Total value	180 u	600 u	1470 u

(a)
Total mass of curry powder
= 180 u + 600 u + 1470 u
= 2250 u

2250 u = 20250

1 u = 20250 ÷ 2250 = 9

Total number of containers of M and N used
= 2 u + 4 u
= 6 u
= 6 x 9
= 54 

(b)
Combined weight of all the curry powder in containers N and containers P
= 600 u + 1470 u
= 2070 u

Difference between the combined weight of all the curry powder in containers N and containers P as compared to the curry powder in containers M
= 2070 u - 180 u
= 1890 u
= 1890 x 9
= 17010 g
= 17.01 kg 

Answer(s): (a) 54; (b) 17.01 kg