Payal Tandon
A 4 min read In a study conducted in Pennsylvania, servers in various restaurants wrote “Thank you” on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of...
Read MoreA 6 min read Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that probably appeared about 520 million years ago, were once among the most controversial of fossils....
Read MoreA 4 min read Archaeologists have firm evidence that Norse explorers reached the coast of North America around A.D. 1000, long before Christopher Columbus’ first voyage to America in 1492. Some people claim to have...
Read MoreA 5 min read Researchers conditioned a group of flies to associate a particular odor with a weak electric shock. Twenty-four and forty-eight hours later the researchers conducted tests on the flies, both individually and in...
Read MoreA 4 min read Question: Seven pieces of rope have an average (arithmetic mean) length of 68 centimeters and a median length of 84 centimeters. If the length of the longest piece of rope is 14 centimeters more than 4 times the...
Read MoreA 3 min read Question: If m = 9/25, w = 15/32, and m + w + c = 1, which of the following gives the values of m, w, and c in increasing order? A. c, m, w B. c, w, m C. m, w, c D. w, c, m E. w, m, c Solution Section: Translate the...
Read MoreA 4 min read Question: From the consecutive integers (-10) to (10) inclusive, 20 integers are randomly chosen with repetitions allowed. What is the least possible value of the product of the 20 integers? Options: A....
Read MoreA 4 min read Question: What values of x have a corresponding value of y that satisfies both xy > 0 and xy = x + y ? Options: A. x <= 1 B. -1 < x <= 0 C. 0 < x <= 1 D. x > 1 E. All real numbers Solution...
Read MoreA 4 min read Question: The product of 3305 and the 1-digit integer x is a 5-digit integer. The units (ones) digit of the product is 5 and the hundreds digit is y. If A is the set of all possible values of x and B is the set of...
Read MoreA 5 min read Question: From a committee of 25 legislators, n members formed a task force. Each member of the task force sent a report to each committee member who was not on the task force. If a letter was sent in response to...
Read More
