How to draw the science and technology tree of school library - Training Enrollment Network

How to draw the science and technology tree of school library

Solution: the number of social story books is x, and the number of science and technology books is y.

D: X+Y=207

( 12/ 13)X=Y-7

From x+y = 207: y = 207-x.

Replace Y=207-X with (12/ 13)X=Y-7.

Get (12/ 13)X=207-X-7.

( 12/ 13)X=200-X

( 12/ 13)X+x=200

(25/ 13)X=200

X= 104

So Y= 103.

A: Storybook 104, Science and Technology Tree 103.

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