Answer :
The amount of water needed is 10 oz.
What is the rule of ratio proportion?
When the ordered pair's second integer, b, is not equal to 0, the ratio is written as a/b. The term "percentage" refers to an equation that makes two ratios equal. In the case of 1 guy and 3 girls, for instance, you may write the ratio as 1: 3. (for every one boy there are 3 girls)
The given data is
If we combine 6oz of medication must be mixed with 15 oz of water.
The oz of water is needed for 4 oz of medication
suppose that x oz of water is needed for 4oz of medication.
Hence,
4oz:x oz=6oz:15 oz
use the ratio proportion rule to solve the above value show as below
4oz/xoz =6oz /15 oz
cross multiply with above value
x=4 oz x 15 oz /6 oz
x=(4×15)oz/6 oz
x=(4×15/6)oz
x= 60/6 oz
X=10 oz
Therefore the amount of water needed is 10 oz
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