If the respective ratio between total number of scarves sold by stores M and N together in 2003 and that in 2008 is 7: 11, what is the total number of scarves sold by stores M and N together in 2008?

Solution

Total number of scarves sold by stores M and N together in 2003

= 390 + 240 = 630

Also, ratio between total number of scarves sold by stores M and N together in 2003 and that in 2008 = 7: 11

=> Total number of scarves sold by stores M and N together in 2008

= $$\frac{11}{7} \times 630$$

= $$11 \times 90 = 990$$

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