Q: The green piece of yarn is 156 cm long. The red yarn is 8 cm more than three times the length of the green yarn. What is the number of centimeters in the total length for the 2 pieces of yarn?
A: Green = 156 cm. Red = 3 * 156 + 8 = 476 cm. 156 + 476 = 632 cm of yarn. The two pieces of yarn have a length of 632 centimeters. The answer is 632.

Q: A chocolate bar weighs 125 g. A shopkeeper has just received a 2 kilogram box of chocolate. How many bars does this represent?
A: We have 2 kg = 2 * 1000 = 2000 g. So, the number of bars of chocolate is 2000 / 125 = 16. The answer is 16.

Q: Tina buys a loaf of bread for $50, 2oz of ham for $150, and a cake for $200. What percent of the cost is the ham and bread?
A:
The total cost of buying bread and ham was $50 + $150 = $200. Together with the cake, Tina paid $200 + $200 = $400 for the items. Since the total percentage for all the items is 100%, the cost of ham and bread is $200 / $400 * 100% = 50% of the total cost of items. The answer is 50.