The diameter of a marble is 3/2 of an inch.How many marbles are needed to make a row of marbles 9 inches long?

6 marbles. Since they stand right next to each other, the length is going to be (# of marbles) * (diameter) = 9.

If i understand the question correctly.

if the diameter of the marble is 3/2 then you need 6 marbles because 3/2 times 6/1 equals 18/2 and 18/2 can be reduced to 9

6

6

You need 6 marbles in line to make 9".

9/(3/2) = (9/1)/(3/2) = (9/1)*(2/3) = (18/3) = 6

you will need 6 marbles to make a row of 9 inches long.

You can't use more than six marbles. One marble is scarcely a row of marbles. But you might call two marbles a row, with marble spacing of 7.5 inches (center to center).

?Now I know, 3/2 equals 1 1/2 and so... the answer is 6 marbles

6 marbles, given that the marbles are placed exactly side by side.

31?