Hani said she would do 3 more situps per minute than Diana would. Diana then did 40 situps at a rate of 4 situps per minute. Calculate the total number of situps they did together.
Since Diana did 40 situps at a rate of 4 situps/minute, she did situps for 40 / 4 = 10 minutes
Hani had to do 3 + 4 = 7 situps per minute if Diana did 4 situps per minute.
So over the 10 minutes Hani did 7*10 = 70 situps.
Together, the total number of situps they did is 70+40 = 110