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?

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.

answer is:

1.75 pounds

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d