Vanessa put together a model train with 25 train cars. Each train car is 80 mm long. How many meters long is Vanessa’s model train if there are no gaps between the cars?

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How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Is the number 128.439 a rational number

Which problem would you use the following proportion to solve for? 24/x=40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?