Friction on Inclined Planes

“A 20 kg box is placed on an inclined plane that makes an angle of 20° with the horizontal. The coefficient of friction between the box and the plane is 0.3. Will the box slide down the plane? Show your calculations and explain your reasoning. A 100 kg crate rests on an inclined ramp at an angle of 15°. The coefficient of friction between the crate and the ramp is 0.15. Will the crate slide down the ramp? Show your calculations and explain your reasoning.”