PROBLEM OF THE WEEK

Out of 100 ladies attending the dance,

85 had a white hand bag;
75 had black shoes;
60 carried an umbrella;
90 wore a ring;

How many ladies must have had all four items?

 

If you have two hourglasses -- one four-minute timer and one seven-minute timer, how can you measure nine minutes?

Pronounced as one letter, And written with three, Two letters there are, And two only in me. I'm double, I'm single, I'm black, blue, and gray, I'm read from both ends, And the same either way. What am I?

There's a land where there's mummies and daddies but no babies. Books but no libraries. Mirrors but no reflections. Kittens but no cats. Cattle but no cows. Lollipops but no candy and trees but no forests. It's the land of what?

A horse was tied to a rope 5 meters long and the horses food was 15 metres away from the horse. How did the horse reach the food?

Two hours ago it was as long after one o'clock in the afternoon as it was before one o'clock in the morning. What time is it now?

There is a barrel with no lid and some wine in it. "This barrel of wine is more than half full," said Curly. "No it's not," says Mo. "It's less than half full." Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

When asked how old she was, Suzie replied, "In two years I will be twice as old as I was five years ago." How old is she?

How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high?

What is the next number in the series?

7,645 5,764 4,576...