Jerry is experimenting with chemicals in the laboratory. he mixes a solution that is 10% acid with a solution that is 30% acid. how much of the 30% acid solution will be needed to make 40 liters of solution that is 25% acid?

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?