The number of liters of a 20% solution of acid, multiplied by 0.20 (20% in decimal form) plus 10 liters of a 30% solution of acid multiplied by 0.30 (30% in decimal form) must be equal to the amount of (x+10) liters multiplied by 0.25 (25% in decimal form)
The linear equation that represent this problem is equal to
I would put: A classroom has 50 people. The ratio of girls to boys is 2:3, so in other words, you need to find out how many boys and girls there are, and there are 2 girls for every three boys, how many boys and girls are there? The answer would be 20 girls and 30 boys, also the ratio describes how many girls there are every amount of boys there are.