The public pool is $5 per session (s), and the private pool is $3 a session after a $20 membership. At what number of sessions will the total cost (t) be equal?
(__ sessions, $__ total cost)

35X+30Y = ?

From S1:

30Y = 900

Y = 30.

No info about X.

Insufficient.

From S2:

X = 90

35*90 = 3150

Also, 3150 = 3.5*30Y

Y = 30.

Sufficient.

B is the asnwer.

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you half the rectangle that you ae asking about so then you would see the scale factor of 1/2 the one u have selected, the one on top is half.

hope this !