Question

divanna scored 67% on her test. IF she had paid closer attention to signs, she would have had 2 more problems right and would have scored 80%. write the expression for how many problems in all she would have answered correctly
bobpursley
x/N=.8
(x-2)/N=.66666

x=.8N
x-2=.6666N

.8N-2=.6666N
.13333N=2
N=15

so there were fifteen questions on the test, and .8N=12

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