Bryan's score on a math exam is 20. Jen scored 10 more than Bryan while Sammy scored 2 fewer than Jen. If the math exam has 35 points in all, how many mistakes did Sammy make?
Натиҷаи Брайан дар имтиҳони математика 20 аст. Ҷен 10 балл бештар аз Брайан гирифт, дар ҳоле ки Сэмми 2 балл камтар аз Ҷен гирифт. Агар имтиҳони математика дар маҷмӯъ 35 балл дошта бошад, Сэмми чанд хато кард?
How many points did Jen score? ** Jen scored 20 + 10 = <<20+10=30>>30 on the exam.
How many points did Sammy score? ** Sammy scored two less, so his score was30 - 2 = <<30-2=28>>28.
How many mistakes did Sammy make? ** Thus, Sammy made 35 - 28 = <<35-28=7>>7 mistakes.
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How many points did Jen score? ** Jen scored 20 + 10 = <<20+10=30>>30 on the exam.  
How many points did Sammy score? ** Sammy scored two less, so his score was 30 - 2 = <<30-2=28>>28.  
How many mistakes did Sammy make? ** Thus, Sammy made 35 - 28 = <<35-28=7>>7 mistakes.  
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