Question 263434
This is a mixture problem with out mixture information. Here is a table based on the given information
alloy . . . . . .% . . . . . .g . . . . . . .%g
70 . . . . . . . 70 . . . . 30 . . . . . .2100
15 . . . . . . .15 . . . . .50 . . . . . .750
mix . . . . . . x . . . . . .80 . . . . . .80x
looking at the third column, we get
{{{2100 + 750 = 80x}}}
adding we get
{{{2850 = 80x}}}
dividing, we get
x = 35.625
which is
35.63% = 35.6%