book Maths Puzzle Numerical Ability

20 men can do a piece of work in 24 days. After working for few days,4 men are added and the work was finished 3 daysearlier.After how many days were 4 men added?

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I'm having trouble with a homework problem can you please help.

Let the supply and demand function for ice cream be given by

p= s(p) = 2/5q and p=D(q) = 100-2/5q

Where A recipe for 2 1/2 dozen whole-wheat muffins requires 600 g of flour. How many muffins can be made with 900 g of flour?