1. WHAT DID I BUY?

When Skid Mark walked into a shop, he bought a bottle of mineral water, 2 sandwiches and a bag of crisps. This cost him 761QEM.

Later on, Exclamation Mark goes into the same shop and buys a sandwich and a bottle of fizzy juice. This cost him 408QEM.

Later, Birth Mark goes into the same shop and buys a bottle of mineral water and a bag of crisps. This cost her 153QEM.

Later on, Book Mark goes into the same shop and buys 3 bottles of mineral water and 2 sandwiches. This cost her 938QEM.

Later on, Question Mark goes into the same shop and buys 4 items. This cost him 555QEM. What did Question Mark buy?

Answer: Question Mark bought 2 bottles of fizzy juice, 1 sandwich and 1 bag of crisps.

Everything costs as follows:

You will notice that the difference in cost between Skid Mark and Birth Mark is 608QEM. This is because they both bought a bottle of mineral water and a bag of crisps, but Skid Mark bought 2 sandwiches so sandwiches cost (608/2=304QEM). Since Book Mark paid 938 for what she bought, 608QEM was used to buy 2 sandwiches, the rest of her money would be used to buy 3 bottles of mineral water, so one bottle costs (330/3=110QEM). Using this information you can work out what everything else costs.

2. STOCKING UP

Your objective is to buy exactly 100 farm animals with exactly 100 dollars. You must buy at least 1 of each animal.

PRICES

How many of each must you buy?

Answer:

3. CASH COW

You decide that you absolutely need one more cow to make your collection of farm animals complete. After searching for coins in sofa cushions, in the washing machine, and in coat pockets, you scrounge together enough money. You have 55 coins totaling $10.00. There are more nickels than pennies, more dimes than nickels, and more quarters than dimes. How many of each coin do you have?

Answer:

5 pennies ($.05), 6 nickels ($.30), 9 dimes ($.90), 35 quarters ($8.75)