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abbiecallicutt
16.11.2019 •
Mathematics
In a class of 100, every boy had 2 girlfriends, but no girl had more than 1 boyfriend. if exactly 13 girls had no boyfriend, then how many students in the class were girls?
the answer is 71 but i dont know how to get 71?
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Ответ:
71 girls
Step-by-step explanation:
The class has 100 students.
It consists of 13 girls with no boyfriends, and the rest are "triplets" (B+2G groups)
If we subtract the 13 girls, the triplets must add up to 87 students.
The number of triplets is 87/3 = 29.
29(B + 2G) = 29B + 58G
The triplets consist of 29 boys and 58 girls with boyfriends.
No. of girls = girls with boyfriends + girls with no boyfriend
= 58 + 13
= 71
There are 71 girls in the class.
Ответ:
3x-1 >x
Step-by-step explanation:
greater than number itself >x. one less is -1. product of number and 3 is 3x