Let's assume the cost of a 2-inch diameter marble is x dollars.
According to the given information, the cost of a 1-inch diameter marble is x - 0.30 dollars.
Rochelle buys 25 1-inch marbles, so she spends 25 * (x - 0.30) = 10 dollars.
This can be simplified as 25x - 7.50 = 10.
Adding 7.50 to both sides, we get 25x = 17.50.
Dividing both sides by 25, we get x = 0.70.
Therefore, the cost of a 2-inch diameter marble is 0.70 dollars.
Hence, the correct answer is 0.70.
Marbles come into Silas when is Skylander and two inch diameter the one is diameter marble cost 30 cents less than the 2-in marbles Rochelle buys 25 1-in marbles for her science project she spends exactly $10 to find the cost of a 2 in marble
2.50
2.80
0.70
0.10
1 answer