One-half cup of black beans provides 15% of the potassium you need daily. You must get the remaining 2890 milligrams from other sources.
How many milligrams of potassium should you consume daily?
? milligrams
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2
Answer:
Let the total amount required be
t
You have 15% already. This means that the amount yet to be taken is:
(
100
−
15
)
%
=
85
%
so
85
%
t
=
2890
write as:
85
100
t
=
2890
Multiply both sides by
100
85
100
85
×
85
100
×
t
=
100
85
×
2890
1
×
t
=
3400
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