Q: How many groups of 2 can be made out of 20 marbles?

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20

a+b=23 b=a+3 a+b a+(a+3)=23 a+a=23-3 2a=20 a=10 green marbles=10 blue marbles =23-10 =13

Let X = the number of green marbles. X+3 = the number of blue marbles. X + (X+3) = 23 2X + 3 = 23 2X = 20 X = 10 or the number of green marbles.

20% Total marbles = 35 + 85 + 30 = 150 Yellow marbles = 30 Percentage yellow marbles = number_of_yellow / total_number x 100 % = (30 / 150) x 100 % = 1/5 x 100 % = 20%

it means a number verses another number, like a fraction Here;s an example you have 10 white marbles, 3 blue marbles, and 7 green marbles. what is the ratio of green marbles to the total amount of marbles? hat you do is look at the green marbles, and in this case, there are 7. Now add up all the marbles, which is 20. Your ratio is then 7:20.

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20

25

20% of 50 marbles is 1 fifth of the marbles in the bag. so 50 marbles divided by 5 =10 blue marbles

If there are 20 red marbles and 40 blue marbles, the ratio of red to blue is 1 over 2. The number of white marbles does not matter.

12/20 = 0.612/20 = 0.612/20 = 0.612/20 = 0.6

a+b=23 b=a+3 a+b a+(a+3)=23 a+a=23-3 2a=20 a=10 green marbles=10 blue marbles =23-10 =13

15 20/4 = 5 5*3 = 15

16/20, which can be simplified if you so wish.

Let X = the number of green marbles. X+3 = the number of blue marbles. X + (X+3) = 23 2X + 3 = 23 2X = 20 X = 10 or the number of green marbles.

9:10

20% Total marbles = 35 + 85 + 30 = 150 Yellow marbles = 30 Percentage yellow marbles = number_of_yellow / total_number x 100 % = (30 / 150) x 100 % = 1/5 x 100 % = 20%

20% are green