In a solution of 140 g of salt, what is the mass of the solution if the salt in it is 35%.

And so, in this solution of 140 g of salt, salt occupies 35% of this solution. The mass of the entire solution is 100%, this problem can be solved by the proportion:
140 g salt – 35%
X g salt – 100%

Now you need to calculate the equation crosswise:
1) 140 * 100 = 14000;
2) 14000: 35 = 400.

Answer: The mass of the solution is 400 g.

You can also solve in another way: 140: 35% * 100% = 400.