3/4 divided by -1/4 simplest form

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In simplest form, it is simply -3

Let c = number of childrenLet t = number of teenagersLet a = number of adults t = 3/4 c 1) c + 3/4 c + a = 5702) 2c + 3 (3/4c) + 5a = 1950 1) 7/4c + a = 5702) 2c + 9/4c + 5a = 1950 1) 7/4c + a = 5702) 17/4c + 5a = 1950 Multiply equation 1 by -51) -35/4c - 5a = -28502)  17/4c + 5a = 1950 Add the equations-18/4c = -900 c = -900 * -4/18 = 200 t = 3/4 c = 150 teenagers