Q:
# Who invented the adding machine?

A:

**The adding machine was invented by French mathematician, physicist and philosopher Blaise Pascal.** Pascal developed his mechanical device, which he named the Pascaline, in 1642. The apparatus, whose predecessor was the abacus, is regarded as the original digital calculator in that it operated by counting integers.

In 1671, the German mathematician and philosopher Gottfried Wilhem von Leibniz expanded on its design, resulting in the Step Reckoner, a calculating machine first built in 1673. The Step Reckoner could multiply as well as add by using repeated addition and shifting.

The first modern computer, the Analytical Engine, was not conceived until several years later in 1834 by English mathematician and mechanical engineer Charles Babbage.

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Q:
## What is the formula used to find percent recovery?

A:When purifying a substance in chemistry, use (collected mass/starting mass)*100 to calculate percent recovery. This formula is also commonly stated as (pure product recovered/crude material used)*100.

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Q:
## How do you figure square feet?

A:To figure out the square footage of an area, you will need a measuring tape and possibly a calculator. Measure length and width and then multiply the two together. The process should take less than five minutes.

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Q:
## What does "24KGB" mean?

A:"24KGB" is short for 24-karat gold bonding. This is a technique in which base layers of 24-karat gold are covered with layers of 14- or 18-karat gold to create a more affordable replica.

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Q:
## What is 169 pounds in kilograms?

A:

Full Answer >**The equivalent of 169 pounds in kilograms is 76.657 kilograms.**A kilogram is a unit of mass within the International System of Units, the system used by most of the world and virtually all of the scientific community. It is the official name for the metric system of measurement.Filed Under: