Question

Marbles come in two sizes: 1-inch diameter and 2-inch diameter. The 1-inch diameter marbles cost 30 cents less than the 2-inch marbles. Rochelle buys 25 1-inch marbles for her science project and spends exactly $10. Find the cost of a 2-inch marble.(1 point)
Responses

$2.50
$2.50

$0.10
$0.10

$2.80
$2.80

$0.70

Answer 1

Let the 2-inch marble cost x dollars. Then the 1-inch costs x − 0.30.
25(x − 0.30) = 10 → x − 0.30 = 0.40 → x = 0.70.

Answer: $0.70.