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.25n + .5n + 18 = n.75n - n = -18-.25n = -18.25n = 18n = 72
n plus 15.n plus 15.n plus 15.n plus 15.
Using Newton's laws, F=ma, where F is the 75N FORCE and you are solving for mass,m. Divide 75N by the acceleration due to gravity on Earth (9.81 m/s^2) to get the mass of the object. ANS: ~7.65 kg
3n.
One lot of them.