In a candy shop, chocolate which sells for $4 a pound is mixed with nuts which are sold for $2.50 a pound are mixed to form a chocolate-nut candy which sells for $3.50 a pound. How much of each are needed to make 30 pounds of the mixture?

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

the bolded word " farsighted" could be replaced with visionary.

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  or  

sin y = 7/q

7 is the opposite side length, q is the hypotenuse

tan y = 7/r

7 is the opposite side length, r is the adjacent side length

using sohcahtoa ^^^^

cos y = adjacent/hypotenuse

cos y = r/q