If the respective ratio between total number of scarves sold by stores M and N together in 2002 and that in 2009 is 15 : 11, what is the total number of scarves sold by stores M and N together in 2009?

Solution

Total number of scarves sold by stores M and N together in 2002

= 240 + 360 = 600

Also, ratio between total number of scarves sold by stores M and N together in 2002 and that in 2009 = 15 : 11

=> Total number of scarves sold by stores M and N together in 2009

= $$\frac{11}{15} \times 600 = 11 \times 40$$

= $$440$$

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