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Ask a math question: Sunflower minus Lotus equals 17, and Lotus minus Flowers equals 5. So how much is the sunflower minus the flowers?
Suppose the unknown: the sunflower is X, the lotus is Y, and the floret is Z. From the meaning of the question, we can draw the following conclusions:

X-Y= 17( 1)

Y-Z=5(2)

Solve X-Z

From (1): X=Y+ 17, substitute (2).

x-Z = Y+ 17-Z = Y-Z+ 17 = 5+ 17 = 22

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