SOLUTION: 1. Fifteen graduating students agreed to buy s laboratory apparatus costing C to be donated yo yheir school. All but 3 were able to give contributions. By how much was the contribu

Question 936919: 1. Fifteen graduating students agreed to buy s laboratory apparatus costing C to be donated yo yheir school. All but 3 were able to give contributions. By how much was the contribution of each who contributed increased?
A. C/10
B. C/15
C. C/30
D. C/60
2. If 3/5 of the students are dismissed at 3:30 p.m. and 3/4 of the remainder at 4:00 p.m., what fraction of the students are dismissed at other times?
A. 3/20
B. 1/10
C. 1/5
D. 3/10
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
1.
if all give contributions each one will be giving of , or
so, answer is: B.
2.
there is students
If " of the students are dismissed at ", we have dismissed
will be
and if of the dismissed at ,we have :

=
=
=
= are dismissed at 4:00 p.m
all together:
are dismissed which is
so,we can write as , then we have => means of the students are dismissed at other times
and your answer is: B.

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