Amon & Rhonda combined have 215 marbles. If Amon owns 55 marbles more than Rhonda, how many marbles does Rhonda have?
Let's think: Let's say Rhonda has m marbles. The total number of marbles that Ammon has is m + 55. Amon & Rhonda combined have m + (m + 55) = 215. This means the total number of marbles they have together is 2m + 55 = 215. 2m = 215 - 55. The total number of marbles that Rhonda has is m = 160 / 2. Rhonda has m = 80 marbles.. The answer is: 80.

A bowl of fruit holds 18 peaches. Four of the peaches are ripe and two more ripen every day, but on the third day three are eaten. How many more ripe peaches than unripe peaches are in the bowl after five days?
Let's think: In 5 days, 2 * 5 = 10 peaches will ripen. With the 4 that were already ripe, there will be 14 peaches that have ripened. Three were eaten, so there will be 14 - 3 = 11 ripe peaches left. There are 18 - 14 = 4 unripe peaches left. Therefore, there will be 11 - 4 = 7 more ripe peaches than unripe peaches in the bowl after five days.. The answer is: 7.

A basketball team won 35 out of the 50 games that they have played. They still have 25 games left to play for the season. How many of the remaining games must they win so that their percentage of wins in the entire season is 64%?
Let's think: There are a total of 50 + 25 = 75 games in the entire season. Sixty - four percent of these games is 75 x 64 / 100 = 48. Since they already won 35, then the team needs to win 48 - 35 = 13 more games.. The answer is: 13.

There are 25 different layers of rock in a canyon's strata. Five of the layers are limestone. Half of the rest are sandstone. Four of the remaining are quartz. Half of the rest are shale. The rest are all different kinds of rock. How many kinds of rock make up only one layer in the canyon's strata?
Let's think:
There are 25 - 5 = 20 layers of rock that are not limestone. Half of those 20 are sandstone, so there are 20 / 2 = 10 that are not limestone or sandstone. Four of those are quartz, so 10 - 4 = 6 layers are not limestone, sandstone, or quartz. Half of the rest are shale, so 6 / 2 = 3 kinds of rock remain that make up only one layer in the strata.. The answer is: 3.