Question

If Alex can do 15 jumping jacks in 20 seconds, how many can he do in 2 minutes

Answer 1

15 , 20 , 30 , 40 , 45 , 60 .... so if he can do 45 jumping jacks in 60 seconds (1 min) then 2 mins would be 45+45 which is 90 jumping jacks. Alex can do 90 jumping jacks in 2 minutes