This a slightly cynical phrase designed to denigrate the art of teaching. It assumes that if you fail in a chosen career you ultimately end up teaching because you didn't make it in the real world as a doer. There a good and bad teachers as well as good and bad engineers.
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This question cannot be answered sensibly. A yard is a measure of distance with dimensions [L]. Basic dimensional analysis teaches that you cannot convert a distance into a measure of area with dimensions [L2] without additional information.
This question cannot be answered sensibly. A kilogram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as from mass to length without additional information.
You cannot. A square metre is a measure of area, with dimensions [L2]. An inch is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
This question cannot be answered sensibly. A kilometre is a measure of distance, with dimensions [L]. A percent is a pure ratio, with no dimensions. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
This question cannot be answered sensibly. The measurements given are for an area, with dimensions [L2]. A foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.