Larry spent 1/2 of his money on a camera and another 1/8 on a radio. the camera cost $120 more than the radio. how much money did he have at first?

1/2-1/8=3/8, so 3/8 of his money equaled to $120. Now divide 120 by 3 to find 1/8 of the money, which is $40, to give you 1/8 of his total money. Now multiply 40 (1/8 of the money) by 8 to give you the full amount, which is $320

Larry had 240 dollars then he spent 120 on a camera then another 30 dollars on a computer leaving him with 90 dollars