Answer:
Total no. of grams in mixture is (15)(0.75) and 0.75(15-x) + 0.9x.
Step-by-step explanation:
Given,
The mass of one metal in grams is 15-x with 70% silver gives 0.7(15-x) g.
The mass of other metal in grams is x with 90% silver gives (0.09)x g.
We have to find the mixture
Given mixture 15 grams with silver content 0.7, then
Total number of grams in mixture is (15)(0.75) ad it is also equivalent to the total sum of mass of above two which gives 0.75(15-x) + 0.9x.