How much of an alloy with 30% copper must be added to 25 pounds of a second alloy which is 20% copper to create a 27% alloy?

A car can travel 480 miles on a full tank of petrol. The tank holds 60 litres. A driver fills the tank and sets off on a journey. How many litres of petrol will be left when the car has travelled 360 miles?

At a high school, being a senior and being a sophomore are mutually exclusive events. The probability that a randomly selected student is a sophomore is 0.23. The probability that a randomly selected student is a senior is 0.21.

Explain the difference between a square and a rectangle

The sales tax used car is 100 and the sales tax rate is 5 percent find the purchase price

What is the solution to the system of equations? x-y=7 3x-2y=8

Five friends want to rent a go-cart track that costs $100. They already have $20. How much more does each friend need to contribute if they each contribute the same amount? Let x represent any unknown value in the problem. Select each correct answer

What is the cost of a comic book after it has been marked up 20% if it costs $3.95

2.5 meters cloth is $28.30the cost of 18 meters?

What is the median of the data set 3 35 23 37 45 5 49 27 48?

In the diagram below BD is parallel to AE, BE bisects angle ABD, angle E is 37 degrees, angle BFE = 117, what is angle C