A bell rings every 2 seconds, and a bird chirps every 3 seconds. If the ring and the chirp occur together right now, they will also occur together in (A) 40 seconds (B)41 seconds (C) 42 seconds (D) 43 seconds

Two students flip coins and record the number of heads. They are supposed to flip 200 coins. The first student flips 200 coins, but the second student flips 100 coins and then doubles the result (a) Find the EV and SE for the number of heads that the first student gets (b) Find the EV and SE for what the second student gets after doubling. c) Find the EV and SE for what the two students get if they add their results.

My uncle comes to visit me every 9 days.  My aunt comes to visit every 15 days.  They were both here today.  How many days from now will I see them both again?

A cricket chirps 6 times every 8 seconds. At that rate, how many times does the cricket chirp in 2 minutes? The odd numbers from 1 through 17 are placed in the magic square so that the sum of the numbers in each row, column and diagonal are equal. What number goes in the square marked "X"? 13 Each small region in the figure shown is a square. The area of the entire figure is 320 sq cm. What is the number of cm in the perimeter of the entire figure? The pages of a book are numbered consecutively, beginning with 1. The digit 7 is printed 25 times in numbering the pages. What is the largest number of pages the book can have? 3.