= 19.59591794
Rachel has $100 in her savings account and deposits an additional $25 per week. Joanna has $350 in her account and is saving $5
2 answers:
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= 19.59591794
Answer:
See explanation
Step-by-step explanation:
There are 26 students at the class.
During a mathematics test, one student made 12 mistakes but everyone else in the class made fewer mistakes than he did. So, all other students made 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 or 0 mistakes (12 different possibilites).
Suppose that at most 2 students in the class made the same number of mistakes. Hence, at most students satisfy this condition. If we add that student who made 12 mistakes, the maximum total number of students in the class could be
students.
But the total number of students is 26, so our hypothesis is incorrect, thus there are at least 3 students in the class who made the same number of mistakes.