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?
Answer: 120
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.
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?
If pentagons have five sides, octagons have 8 sides, decagons have 10 sides and hexagons have 6. How many sides does a family of 3 have on their dining table?
