On Friday there were 367 + 178 = 545 boys and girls who rode the Twister
On Saturday there were 165 + 218 = 383 boys and girls who rode the Twister
n = 545 - 383 = 162
If you put another rectangle box with the number 162 inside where n is, then the Saturday strip diagram will be the same length as the Friday strip diagram.
That's why B is the answer. Because it finds the difference between the total number of children on both days.
thankyou so much for the explanation. I appreciated it.
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