Every bedtime, Juwella reads a book. Three nights ago, she read 15 pages. Two nights ago she read twice that many pages, while last night she read 5 pages more than the previous night. She promised to read the remaining pages of the book tonight. If the book has 100 pages, how many pages will she read tonight? Give the rationale and then the answer.
Let's think step by step. Juwella read 15 x 2 = 30 pages two nights ago. She read 30 + 5 = 35 pages last night. She read a total of 15 + 30 + 35 = 80 pages for three nights. Thus, she needs to read 100 - 80 = 20 pages tonight to finish the book.. The answer is: 20.

Mia has 4 times as many shells as David. Ava has 20 more shells than Mia. Alice has half the number of shells Ava has. If David has 15 shells, what the total number of conch shells they all have? Give the rationale and then the answer.
Let's think step by step. If David has 15 shells, then Mia has 4 * 15 = 60 shells. Ava has 20 more shells than Mia, so that is 60 + 20 = 80 shells. Alice has 1 / 2 the number of shells Ava has, which is 1 / 2 * 80 = 40 shells. The total number of shells all of them have is 15 + 60 + 80 + 40 = 195 shells.. The answer is: 195.

Beth went shopping. She bought 15 more cans of peas than twice the number of cans of corn that she bought. If she bought 35 cans of peas, how many cans of corn did she buy? Give the rationale and then the answer.
Let's think step by step. Let the number of cans of corn she bought be a. Twice the number of corn cans is 2 * a = 2a. The 35 cans of peas were 15 more than twice the number of corn cans which means 15 + 2a = 35. Solving the equation: 2a = 20. a = 20 / 2 = 10 cans of corn.. The answer is: 10.