marykayy0218own5cp
29.08.2019 •
Mathematics
There are 42 students in student council. the ratio of girls to boys is 10: 11. how many girls are in student council?
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Ответ:
10+11=21 units
42 divided into21 is
42/21=2
each unit is 2
girles=10 units=10 times 2=20
boys=11 units=11 times 2=22
20 girle
Ответ:
Ответ:
2568.75 - 2500 = 68.75;
( ? / 100 ) * 2500 = 68.75 ;
? * 25 = 68.75;
? = 68.75 ÷ 25
? = 2.75;
r = 2.75 %