3 years ago

How can you quickly calculate 20 percent of any bill amount?

Mathematics

2 answers:

Olin [163]3 years ago

8 0

Turn 20 into 20/60 then divide them
It equals 3
3%

inna [77]3 years ago

6 0

Take it and divide it by 5, or you can multiply it by .2

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slega [8]

A suitable calculator* can do this easily.

61°38'45" = (61 +(38 +45/60)/60)° ≈ 61.65°

_____
I like the RealCalc app for Android, but many graphing calculators also will do this conversion. Of course, you can simply evaluate the expression as above.

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What quantity of a 65% acid solution must be mixed with a 25% solution to produce 600 mL of a 45% solution?

soldier1979 [14.2K]

Lets say x is quantity
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.65x+.25(600-x)=.45*600
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3 years ago

What kind of triangle is this?

Talja [164]

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