In a restaurant recently, I received the following bill: Starter $7.00 Main Course $20.75 Dessert $9.75 Drink $4.50 Service Charge $5.25 TOTAL $47.25 What percentage of the cost of the food and drink had been added to the bill as service charge?

A cleaning solution is used to remove limescale, CaCO3, from bathroom surfaces. When the solution is sprayed onto the limescale, effervescence (fizzing) occurs and the solid limescale begins to disappear. This chemical reaction is needed because the limescale cannot be removed with water alone. Which of the following statements about this chemical reaction are correct? 1 The cleaning solution is acidic. 2 The effervescence (fizzing) is caused by the release of hydrogen gas. 3 The pH of the reacting solution will go down as the reaction proceeds. 4 The salt produced in the reaction is more soluble than CaCO3

The price for hiring a car is determined by the number of days for which it is to be hired and the number of people who will be using it. The table below shows the prices for groups of up to 5 people hiring cars for up to 7 days. Patrick is part of a group of 5 people on a holiday for 5 days. They will be going on outings each day, and had planned to hire one car for all of them for all 5 days. However, two of the group of people will only be there for the first 3 days, so an alternative is to hire one car for this period and another for the final two days. What will be the difference if they choose this alternative?

A cleaning solution is used to remove limescale, CaCO3, from bathroom surfaces. When the solution is sprayed onto the limescale, effervescence (fizzing) occurs and the solid limescale begins to disappear. This chemical reaction is needed because the limescale cannot be removed with water alone. Which of the following statements about this chemical reaction are correct? 1. The cleaning solution is acidic. 2. The effervescence (fizzing) is caused by the release of hydrogen gas. 3. The pH of the reacting solution will go down as the reaction proceeds. 4. The salt produced in the reaction is more soluble than CaCO3

A recipe for tarte Tatin requires: 500g pastry 800g apples 100 g caster sugar 100 ml apple juice 6g of vanilla 50 g of butter Amber, Bekim, Cairo, and Darcy have the following quantities of each ingredient: The quantity is given in the image below Who can make the largest tarte Tatin?

Many people were worried when they found that their photocopiers had been sometimes changing numbers; one photocopier sometimes, although not always, changed 6 into 8. A list of prices was copied on this photocopier. The first five prices on the copy·are shown below. $54.80 $60.00 $65.40 $70.80 $78.20 In the original list, the prices had increased by the same amount each time. What was the next price.on the original list?

Mr and Mrs Porter drove down to see Sweeney. Mr Porter drove the first 20 km on the way there, and Mrs Porter drove the rest of the way. On the return journey, she drove the first 30 km and he drove the rest. How much farther did Mrs Porter drive than Mr Porter?