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In 4 hours at 60 miles per hour, he travels 4 hours * 60 miles per hour = 240 miles. In 8 hours at 45 miles per hour, he travels 8 hours * 45 miles per hour = 360 miles. In total, he travels 240 miles + 360 miles = 600 miles. In total, he drives for 4 hours + 8 hours = 12 hours. Therefore, his average speed is 600 miles / 12 hours = 50 miles per hour. So the answer is 50

One 

When calculating the number of objects that are in pairs, the correct answer is one. For instance, if there are 11 pairs of socks and each pair has 2 pairs of shoes, then the result of adding 2 to 11 is 22. This is equal to 1 pair plus 1 sock. Similarly, adding 2 to 11 gives 22 pairs of shoes, which is 1 pair plus 1 shoe. In both instances, the result of 2 to 11 is 1 unit, even if the total of the items is greater than 1.

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Please don't be rude to Cphill. Being rude to Cphill is not ok, even if you disagree with them or think they are wrong. Instead of downvoting peoples posts, respect is important, and we should all treat each other with kindness. Let’s leave this in the past, and move on with the conversation.

Elevation = (7/13)x - 44

Elevation at the top = (1/3)(x - 44)

Since we know that when he reaches the top, the elevation would be equal to (7/13)x - 44, we can set up an equation:
(1/3)(x - 44) = (7/13)x - 44

To simplify this equation, we can multiply both sides by 3 to eliminate the fraction:
x - 44 = (21/13)x - 132

Next, we can isolate x by subtracting (21/13)x from both sides and adding 44 to both sides:
x - (21/13)x = -132 + 44

x = 143

The distance he reached the top of the mountain is 143.

A piano has many keys, but it cannot open a single door because it is a musical instrument and not a lock or a key.

Let's set up a system of equations based on the given information:

Let "x" be the number of stamps Jeremy initially has.

According to the first condition, if he gives each friend 2 stamps, he will have 6 stamps left: x - 2f = 6, where "f" is the number of friends.

According to the second condition, if he gives each friend 3 stamps, he will be short of 1 stamp: x - 3f = -1.

Now have a system of two equations:
x - 2f = 6

x - 3f = -1

Let's solve this system to find the value of "x" (the number of stamps Jeremy has):

Subtracting equation 2 from equation 1 gives: 
(x - 2f) - (x - 3f) = 6 - (-1)

x - 2f - x + 3f = 6 + 1

f = 7.

Now can substitute the value of "f" into either equation 1 or 2 to solve for "x." Let's use equation 1: 
x - 2(7) = 6

x - 14 = 6

x = 6 + 14

x = 20.

Therefore, Jeremy has 20 stamps.

So, the correct answer is:

1. 20

Let the number of blue marbles is B and the number of red marbles initially is R.

There were 2/5 as many red marbles as blue marbles in a box.

This gives us the equation

R=(2/5)​B  ------(1)

After 44 blue marbles were removed from the box, there were 3/2 times as many red marbles as blue marbles. After removing 44 blue marbles, the new number of blue marbles in the box is B−44.

At this point, the number of red marbles is R(since it remains unchanged).

The second statement gives us the equation 

R=​(3/2)(B−44)​B ------(1)

Now from the equation (1) and (2) we have,

2/5B = 3/2(B - 44)

=> 4B = 15(B - 44)

=> 11B = 15 * 44

=> B = 60.

So, there were initially 60 blue marbles in the box.

To find the number of red marbles, we can use the first equation:

R = (2/5)B = 2/5 * 60 = 24.

The number of red marbles is 24.