Mason is mixing up some salad dressing. He takes a bowl that holds 150 ml and fills it 2/3rds with oil and 1/3rd with vinegar. The oil weighs 5 g/ml and the vinegar weighs 4 g/ml. How many grams does the salad dressing weigh?
Let's think: First find how many ml of oil Mason adds by multiplying the volume of the bowl by the proportion filled with oil: 150 ml * 2 / 3 = 100 ml. Then repeat the process to find how many ml of vinegar he added: 150 ml * 1 / 3 = 50 ml. Now find the weight of the oil by multiplying the volume by the weight / volume ratio: 100 ml * 5 g / ml = 500 g. Do the same procedure with the weight and weight / volume ratio of the vinegar to find its weight: 50 ml * 4 g / ml = 200 g. Now add the weight of the oil and the vinegar to find the weight of the salad dressing: 500 g + 200 g = 700 g.. The answer is: 700.

Kirill is 14 less centimeters in height than his brother. Together their heights equal 112 centimeters. How tall is Kirill in centimeters?
Let's think: Let B = brother's height in cm. Kirill = B - 14. 2B - 14 = 112 cm. 2B = 126. B = 63 cm. Kirill = 63 - 14 = 49 cm. Kirill is 49 centimeters tall.. The answer is: 49.

In four years, Annika will be three times as old as Hans. If Hans is now 8 years old, how old is Annika now?
Let's think: In four years, Hans will be 8 + 4 = 12 years old. Then Annika will be 12 * 3 = 36 years old. So Annika right now is 36 - 4 = 32 years old.. The answer is: 32.

James buys a jar of hot sauce.  Each serving is .5 ounces. He uses 3 servings every day. if the container is 2 ounces less than 1 quart how many days will it last?
Let's think:
A quart is 32 ounces so this jar is 32 - 2 = 30 ounces. James uses 3 * .5 = 1.5 ounces a day. So it last 30 / 1.5 = 20 day.. The answer is: 20.