Please help me find some jokes about fractional division (suitable for students in Grade 5 and 6).

The train speed 120km is equivalent to one fifteenth of that of supersonic aircraft. How many kilometers does this plane fly per hour?

120 / 1/ 15= 120* 15= 1800

There is a pasture with 30 cows, the number of which is four-ninth less than that of sheep. How many sheep do you have?

30 / ( 1—4/9)=54

To build an expressway, two-fifths of the total length has stopped, and there are still 7 kilometers from the midpoint. What is the total length of this highway?

7 / ( 1/2—2/5)=70