A twin-engine plane flies 720 mi in the same amount of time as it takes a single-engine plane to fly 440 mi. The[..]

How many years will it take an investment of $1000 to double itself when interest is compounded annually at 6%?

Radiation machines used to treat tumors,produce an intensity of radiation that varies inversely as the square of the[..]

A certain mountain has an elevation of 19,128 feet. In 1916, the glacier on this peak covered 10 acres. By 2003 this[..]

THE ZOO CHARGES $9 FOR AN ADULT ADMISSION AND $5 FOR EACH CHILD. TOTAL BILL FOR 191 PEOPLE WAS $1095. HOW MANY[..]

Sheila has been given 5 minutes to solve 20 arithmetic problems. What is the minimum rate Sheila can work in order[..]

The electrical resistance of a wire varies directly with its length and inversely with the square of its radius. If[..]

IN SOME YEAR ONE SITE ADDED 0.5 MILLION NEW ACCOUNTS EVERY DAY AT THIS RATE HOW MANY DAYS WOULD BE NEEDED TO ADD 40[..]

A boat travels down a river for 2 h (traveling with the current), then turns around and takes 4 h to return[..]

A chemist has two alloys, one of which is 10% gold and 10% lead and the other which is 40% gold and 30% lead. How[..]