Asked by Mary

The ratio of red marbles to blue marbles in a jar is 2 to 5. If there are 35 marbles in the jar, how many red marbles are there?

Do have the right answer: 2:35
Answered by oobleck
no. Start with
ratio of red marbles to blue marbles in a jar is 2 to 5
That is, there are 2x reds and 5x blues.
Now you know that there are 35 in total, so what's next?
Answered by Mary
2/5:35=14
is this right
Answered by oobleck
no. for every 2 reds, there are 5 blues.
So, reds are only 2/7 of the total.
2/7 * 35 = 10

What you should have done was solve for x:
2x+5x = 35
7x = 35
x = 5
Now, reds = 2x = 10
blues = 5x = 25
Answered by Mary
The ratio of red marbles to blue marbles in a jar is 2 to 5. If there are 35 blue marbles in the jar, how many red marbles are there?

5 x7 =35
2x7=14 red marbles

is this right
Answered by Mary
The ratio of red marbles to blue marbles in a jar is 2 to 5. If there are 35 blue marbles in the jar, how many red marbles are there?

5 x7 =35
2x7=14 red marbles

is this right
Answered by oobleck
no, no, no ...
collect a group of 7 marbles: 2 red, 5 blue
How many such groups can you make with 35 marbles?
5, Since 5*7 = 35
So, 5 groups, each with 2 reds and 5 blues.
so, 10 reds and 25 blues
10:25 = 2:5
Why did you not just solve for x as I showd you, and then
red = 2x = 2*5 = 10
blue = 5x = 5*5 = 25
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