Four hundred milligrams is equal to how many grams?

A. 4 g

B. 0.4 g

C. 400,000 g

D. 0.00004 g

Answer Explanation:

we are asked to change 400 mg to g. We use the conversion 1g=1000mg, which we can write as:

So, 400 mg to g becomes

Therefore, the Correct Answer is B.

Q #1: A family is planning a driving vacation and is estimating the price of gasoline. While on the vacation, the family plans to drive 3,000 miles. The car gets about 25 miles per gallon, and the cost of gasoline is $1.66 per gallon. Which of the following is the estimate for cost of gasoline for the vacation?

A. $120.00

B. $41.50

C. $72.29

D. $199.20

Answer Explanation

We solve the problem by first finding the amount of gallons needed for the whole trip then find the cost of the gallon.

The car uses 1 gallon to cover 25 miles, which is same as:

Now, in 3000 miles, the car will use how many gallons of gasoline?

A trip of 3000 miles will need 120 gallons. And to find the cost of 120 gallons, we proceed as follows:

The family will spend $199.20 to drive for 3000 miles.
Q #2: The graph below compares the age of car to its value. Which of the following is the age of the car when its value is $12,500?

A. Between 2 and 3 years

B. Less than 1 year

C. Greater than 3 years

D. Between 1 and 2 years

Answer Explanation

We extrapolate the values of a line between 10 and 15 on y-axis to meet the curve and drop another line from the intersection of the curve to meet the x-axis and read off the age of the car.

Now, let’s extrapolate in the following diagram

The intersection of the line and the x-axis is between 4 and 5 years. This means that the car is about 4.5 years old. From the options given, the age of the car is more than 3 years old.
Q #3: Which of the following is the correct conversion of 2 3/4 yards into inches?

A. 33 inches

B. 11 inches

C. 75 inches

D. 99 inches

Answer Explanation

we use the US customary system of units’ equivalent to convert from yards to inches. We know that 1yard=3 ft, and 1 ft =12 inches.

First, convert 2 ¾ into an improper fraction.

Then,