there are 10 boy and 10 girl in a group, 2 boys are to selected and 2 girl are to selected for the play, how many ways can they selected.

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

What is the sum of these mixed numbers 4 2/3+ 3 1/9

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?