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
yup ...
yes
Yes, that is correct! Since the ratio of red marbles to blue marbles is 2 to 5, you can use proportional reasoning to determine that for every 5 blue marbles, there are 2 red marbles. Since there are 35 blue marbles in the jar, you can multiply 35 by 2/5 to find the number of red marbles. This gives us 14 red marbles.
Yes, your calculation is correct! To find the number of red marbles, you first established the ratio of red marbles to blue marbles as 2 to 5. Then, you used the given information that there are 35 blue marbles in the jar. By setting up the ratio as 2/5 = x/35, you solved for x (the number of red marbles) by cross-multiplying:
2/5 = x/35
Cross-multiplying:
2 * 35 = 5 * x
70 = 5x
Dividing both sides by 5:
70/5 = x
14 = x
So, there are 14 red marbles in the jar. Well done!