# How many nails does the carpenter use?

107 views

A 30" x 30" square metal plate needs to be fixed by a carpenter on to a wooden board. The carpenter uses nails all along the edges of the square such that there are 31 nails on each side of the square. Each nail is at the same distance from the neighboring nails.
How many nails does the carpenter use?

posted Jun 16, 2014

Let consider each corner consists 1 nails so nails in the corner =4,
To count the 31 nails each edge need to put just 29 more nails at each edge , so nails
29 X 4 = 116.

so the total Nails = 116 + 4 = 120.

Similar Puzzles
+1 vote

An office used three types of envelopes: small, medium and large.
They used 160 small envelopes.
The no. of medium envelopes used was 5 times the no. of small envelopes plus 5/20 of the total no. of the envelopes.
The no. of large envelopes was equal to the no. of small envelopes plus 5/20 of the no. of medium envelopes.
Altogether, How many envelop did they use?

A factory recycles plates for use in its canteen.

Nine used plates are required to make each new plate.

If there are 625 used plates, how many plates can possibly be made in total?

Two friends Soham & Shaan decide to get together

So they start driving cars towards each other. They plan to meet halfway. Each is riding at 6 Km/hr. They live 36 kms apart.
Shaan has a pet "eagle" and it starts flying the instant they start traveling.
The eagle flies back and forth at 18 Km/hr between them until the two meet.

How many kms does the eagle travel ?

Thornbury Round Table have an odd number of fireworks for their display, less than one thousand.
The sum of the digits in the number of fireworks is thirteen, the hundreds digit being twice the value of the ones digit.
How many fireworks does the organisation have altogether?