Answers:
The amount of potassium from black beans is 510 mg
The total amount of potassium needed daily is 3400 mg
Explanation:
1- getting the total amount of potassium needed daily:
Assume that the total amount needed daily is x
We know that:
We can get 15% of the potassium needs from half a cup of black beans.
This means that:
remaining amount = 100% - 15% = 85%
We are given that the remaining amount is 2890 mg, therefore:
85% x = 2890 mg
0.85x = 2890 mg
x = 3400 mg of potassium
2- getting the amount of potassium in black beans:
We know that:
one half of a cup provides 15% of the daily needs
We have calculated that:
Total daily need = 3400 mg
Therefore:
half a cup would provide = 15% * 3400
half a cup would provide = 0.15 *3400
half a cup would provide = 510 mg of potassium
Hope this helps :)
