Problema Solution
in the united states, the highest incidence of fraternal twin births occurs among asian-americans, then african-americans, then caucasians. of every 16200 births, the total number of fraternal twin births for all three is 778, where there are 195 more for asian-americans than african-americans and 242 more for asian -americans than caucasians. determine the number for each race
Answer provided by our tutors
Let the no. fraternal twin births for caucasians be x.
Then, No. of asian americans=242+x
No. of african-americans=242+x-195
Now,
x+242+x+242+x-195=778
or, 3x+484-195=778
or, 3x+289=778
or, 3x=778-289
or, x=489/3
or, x=163
Therefore,
No. of caucasians=163
African-americans=163+49=210
Asian-americans=242+163=405