The question is asking what mass of each Salyut. So an a C L in n two c 03 is present in a 285 grams solution that contains 5% by mass of N A. C l and 7.5% by mass of N two c 03 So I've written out what we're given. So that's all right in here. And I've also written out to feed percent mass formula, which is equal to mass of the soul Ute divided by the total mass of the solution, which is this to 85 grams here, uh, multiplied by 100. So we're given the percent mass for each of these soul Eudes here and here. So we are trying to solve for the mass of the Salyut. So first, let's find the mass of an A C l, which is our first saw you. So I'm just gonna write in what we have into the formula. So 5% and we're looking for massive the salutes that's are unknown. I'm just going to write X as our unknown variable and divided by mass of the solution, which is to 85 grams this is all multiplied by 100. So in order to work backwards and solve for this X, we have to divide both sides by 100 as this number was multiplied by 100. So if we divide both sides, this will cancel out and five divided by 100 gives us zero point 05 equals X over to any five grams. We rearrange the equation you can solve for X so X is equal to 0.5 multiplied by 200 and 85 grams and this is equal to 14 way to five grams. So now we can solve for the mass of end to see 03 Also Sorry. Go back to this number. We can around this to 14. 23 grams. Okay, Now, to solve for the mass of end To see 03 you do the same thing. So you feeling when we have you have 7.5 0% by mass, which is equal to mass of into CEO three, which we're gonna replace with X, the unknown variable divided by massive a solution which is to 85 grams times 100 and again we're gonna divide both sides by 100 toe isolate for X. Get rid of this term. Did I buy 100? And this gives us zero point 075 which is equal to X over to 85 grams. And again we can rearrange for X, which is equal to zero point 075 well supplied by Teoh 85 grams and this gives us 21 point 375 grams, which we can round two 21.4 grams. So these are our two answers. This is the mass of N A C l. And this is the math, uh, and to see oh, free.