Hi,

Lt x represent the % score on the last test.

student needs at least 80% of all points on the tests in a class to get a B



235 + x = 320

x = 320-235 = 85

x = 85%  Student needs an 85%  on the last test

250 Question Test

.85*250 = 212.5

Students needs a 'score' of at least 213 on last test 

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