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Help me for 20 points!!!

Can someone check if i did this correct. it’s number 4 if you’re wondering.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

(05.02)a farmer has decided to divide his land area in half in order to plant soy and corn. calculate the area of the entire area so he knows how much soil is needed. a parallelogram with a height of 6 yards and side length 9 yards. the height forms a triangle with the slanted side of the rhombus with a base of 2.5 yards. rhombus is split into a soy half and a corn half. each bag of soil covers 40 square yards. how many bags should the farmer purchase?