Question

predict what would happen if we all used non standard measuring tools to measure

Answer 1

then every one have different measurement .and the things will never distributed everyone equally.and hence standard measurement is used .
hope it helps you

Answer 2

Standard units of measurement are units of measurement that are typically used within each measurement system, such as inches, feet, ounces, pounds, kilograms, or cups. ... Nonstandard units of measurement are units of measurement that aren't typically used, such as a pencil, an arm, a toothpick, or a shoe.

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