Excuse me, how to do fractional division and fractional application in the second volume of grade five?

1, 25+20=45 (person) A: The number of boys accounts for 25/45 of the class.

2.1-(1/5+1/6) = 19/30 A: The watermelon planting area accounts for19/30 of this land.

3, 24 ÷ 20 = 1.2 (times) A: It is 1.2 times that of girls, and 5/6 of that of boys.

4.3/5+1/8 =1/40 (ton)1/40+3/5 = 35/ 40 (ton) Answer: Grade 5 or 6 * * * garbage.

The big one is the denominator, and the small one is the numerator.