Oral puzzles

Jai Ganesh · 2017-12-20 14:00:38

Hi,

The solution #3865 is correct. Neat work, Monox D. I-Fly!

#3866. If diameter of a circle is increased by 40%, then by what percent does its area increase?

Jai Ganesh · 2017-12-22 01:09:01

Hi,

#3867. If the area of a sector of a circle is 7/20 of the area of the circle, then find the sector angle.

Monox D. I-Fly · 2017-12-22 12:57:52

Jai Ganesh · 2017-12-22 14:28:12

Hi,

The solution #3867 is correct. Excellent, Monox D. I-Fly!

#3868. If the area of a sector of a circle bounded by an arc of of length

cm is equal to square centimeters, then find the radius of the circle.

Jai Ganesh · 2017-12-24 00:33:21

Hi,

#3869. The hour hand of a clock is 6 centimeters long. Find the area swept by it between 11.20 am and 11.55 am.

Jai Ganesh · 2017-12-26 00:31:58

Hi,

#3870. The radius of a wheel is 0.25 meter. Find the number of revolutions it will make to travel a distance of 11 kilometers.

Jai Ganesh · 2017-12-28 00:21:00

Hi,

#If the difference between the circumference and radius of a circle is 37 centimeters, find its area.

Monox D. I-Fly · 2017-12-28 12:47:58

Jai Ganesh · 2017-12-28 13:59:26

Hi,

(That was by oversight!)

The Solution #3871 is correct. Good work, Monox D. I-Fly!

#3872. If the area of a sector of a circle bounded by an arc of length

centimeters is equal to square centimeters, then find its radius.

Jai Ganesh · 2017-12-30 00:14:01

Hi,

#3873. If

is taken as , find the distance in meters covered by a wheel of diameter 35 centimeters, in one revolution.

Jai Ganesh · 2017-12-31 08:19:59

Hi,

#3874. If the perimeter of a circle is equal to that of a square, find the ratio of their areas.

Jai Ganesh · 2018-01-02 01:01:25

Hi,

#3875. If the circumference of a circle increases from

to , then its area is
(a) halved
(b) doubled
(c) tripled
(d) quadrupled

Monox D. I-Fly · 2018-01-02 12:36:46

Jai Ganesh · 2018-01-02 13:45:06

Hi,

The solution #3875 is correct. Neat work, Monox D. I-Fly!

#3876. If the circumference and the area of a circle are numerically equal, then the diameter of the circle is
(a)

(b)
(c) 2
(d) 4

Jai Ganesh · 2018-01-04 00:17:33

Hi,

#3877. If the area of a circle is equal to the sum of the areas of two circles of diameters 10 cm and 24 cm, then find the diameter of the larger circle (in cm).

Monox D. I-Fly · 2018-01-04 12:50:43

Jai Ganesh · 2018-01-04 14:27:18

Hi,

The solution #3877 is correct. Good work, Monox D. I-Fly!

#3878. The ratio of the outer and inner perimeters of a circular path is 23:22. If the paths is 5 meters wide, then find the diameter of the inner circle.

Jai Ganesh · 2018-01-06 00:37:41

Hi,

#3879. A copper rod of diameter 1 cm and length 8 cm is drawn into a wire of length 18 m of uniform thickness. Find the thickness of the wire.

Jai Ganesh · 2018-01-08 00:25:11

Hi,

#3880. The largest sphere is carved out of a right circular cylinder of radius 7 cm and height 14 cm. Find the volume of the sphere.

Jai Ganesh · 2018-01-10 00:59:44

Hi,

#3881. The diameter of a metallic sphere is equal to 9 cm. It is melted and drawn into a long wire of diameter 2 mm having uniform cross-section. Find the length of the wire.

Jai Ganesh · 2018-01-11 23:15:24

Hi,

#3882. Solve:
152x - 378y = -74,
-378x + 152y = -604.

Jai Ganesh · 2018-01-13 00:10:01

Hi,

#3883. Solve:

,
.

Jai Ganesh · 2018-01-15 00:14:30

Hi,

.

#3884. A box contains 90 discs which are numbered from 1 to 90. If one disc are drawn at random from the box, find the probability of it bearing
(i) a two digit number
(ii) a perfect square number
(iii) a number divisible by 5.

Jai Ganesh · 2018-01-17 00:42:21

Hi,

#3885. Find the probability of a number selected from the number 1 to 25 is not a prime number when each of the given numbers is equally likely to be selected.

Jai Ganesh · 2018-01-19 00:51:47

Hi,

#3886. Five cards - the ten, jack, queen, king, and the ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random.
(i) What is the probability of the card is the queen?
(ii) If the queen is drawn and put aside, what is the probability of the second card picked up is (a) an ace? (b) a queen?

Math Is Fun Forum

#5651 2017-12-20 14:00:38

Re: Oral puzzles

#5652 2017-12-22 01:09:01

Re: Oral puzzles

#5653 2017-12-22 12:57:52

Re: Oral puzzles

#5654 2017-12-22 14:28:12

Re: Oral puzzles

#5655 2017-12-24 00:33:21

Re: Oral puzzles

#5656 2017-12-26 00:31:58

Re: Oral puzzles

#5657 2017-12-28 00:21:00

Re: Oral puzzles

#5658 2017-12-28 12:47:58

Re: Oral puzzles

#5659 2017-12-28 13:59:26

Re: Oral puzzles

#5660 2017-12-30 00:14:01

Re: Oral puzzles

#5661 2017-12-31 08:19:59

Re: Oral puzzles

#5662 2018-01-02 01:01:25

Re: Oral puzzles

#5663 2018-01-02 12:36:46

Re: Oral puzzles

#5664 2018-01-02 13:45:06

Re: Oral puzzles

#5665 2018-01-04 00:17:33

Re: Oral puzzles

#5666 2018-01-04 12:50:43

Re: Oral puzzles

#5667 2018-01-04 14:27:18

Re: Oral puzzles

#5668 2018-01-06 00:37:41

Re: Oral puzzles

#5669 2018-01-08 00:25:11

Re: Oral puzzles

#5670 2018-01-10 00:59:44

Re: Oral puzzles

#5671 2018-01-11 23:15:24

Re: Oral puzzles

#5672 2018-01-13 00:10:01

Re: Oral puzzles

#5673 2018-01-15 00:14:30

Re: Oral puzzles

#5674 2018-01-17 00:42:21

Re: Oral puzzles

#5675 2018-01-19 00:51:47

Re: Oral puzzles

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