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Answer:
Harry had 180 brownies at first.
Step-by-step explanation:
1. Total brownies: 155 × 2 = 310
2. Let H be the number of brownies Harry had at first.
3. Let B be the number of brownies Ben had at first.
4. We have:
H +B = 310
H -25 = B+25 or H- B= 50
5. Solve the equations:
H+ B = 310
H-B= 50
6. Add the two equations:
(H + B) + (H -B) = 310 + 50
2H = 360
H = 180