You are at a restaurant and receive a bill for $65.82. How much will you leave for a tip if you wanted to leave an 18% tip

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

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?