when arranged in descending order is

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The fractions $$\frac{7}{11},\frac{16}{20},\frac{21}{22}$$ when arranged in descending order is

A $$\frac{7}{11},\frac{16}{20},\frac{21}{22}$$

B $$\frac{21}{22},\frac{7}{11},\frac{16}{20}$$

C $$\frac{21}{22},\frac{16}{20},\frac{7}{11}$$

D $$\frac{7}{11},\frac{21}{22},\frac{16}{20}$$

pavan ? Jul 2 '2017 at 12:56

Answer is $\frac{21}{22}>\frac{16}{20}>\frac{7}{11}$

Explanation:

$\frac{7}{11} vs \frac{16}{20} => \frac{140 \text{ vs }176}{11 \times 20}=> \frac{7}{11}<\frac{16}{20}$

further

$\frac{16}{20}vs\frac{21}{22} => \frac{352 \text{ vs } 420}{20 \times 22}=>\frac{16}{20}<\frac{21}{22}$

$=>$ Descending order is 

$\frac{21}{22}>\frac{16}{20}>\frac{7}{11}$

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Who invented telephone ?

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Who invented telephone ?

AThomas Alva Edison

BGalileo

CAlexander Graham Bell

DG. Marconi

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Albert Einsten was a famous

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Albert Einsten was a famous

APhysician

BChemist

CPhysicist

DBiologist

eranna ? Jul 2 '2017 at 12:19

Answer is  Physicist

Explanation:

Albert Eienstin was or famous physicist. He gave the famous Relativity and the equivalency of Energy and matter i.e. $E =mc^2$

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The steam engine was invented by

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The steam engine was invented by

AJames Watt

BJames Prescott Joule

CNew Commen

DG. Marconi

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The radius of a right circular cone is 3 cm and its height is 4 cm

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The radius of a right circular cone is 3 cm and its height is 4 cm. The curved surface of the cone will be

A $$12 \pi \text{ sq.cm}$$

B $$15 \pi \text{ sq.cm }$$

C $$18 \pi \text{ sq.cm }$$

D $$21 \pi \text{ sq.cm}$$

balakrishna ? Jul 2 '2017 at 11:27

Answer is $15 \pi \text{ sq.cm }$

Explanation:

Slant height of the cone $l = \sqrt{r^2+h^2}$

= $\sqrt{3^2+4^2}$

= $\sqrt{9+16}$

=$\sqrt{25}=5 \text { cm}$

$\therefore$ Area of the curved surface

= $\pi rl$

$=\pi \times3\times5$

$= 15 \pi \text{ sq.cm}$

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The sides of a triangle are in the ratio 3:5:7 and its perimeter is 30 cm.

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The sides of a triangle are in the ratio 3:5:7 and its perimeter is 30 cm. The length of the greatest side of the triangle in cm is

A6

B10

C14

D16

ranjith ? Jul 2 '2017 at 11:7

Answer is 14

Explanation:

Let the sides of the triangle be 3x,5x and 7x units.

According to the questions

3x+5x+7x=30

=> 15x = 30

$x = \frac{30}{15} =2$

Largest side = 7x

$= 7 \times 2$

=14

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A horse is tied to a peg hammered at one of the corner of a rectangular grass field of 40 m by 24 m by a rope 14 m long. Over how much area of the field can the horse graze ?

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A horse is tied to a peg hammered at one of the corner of a rectangular grass field of 40 m by 24 m by a rope 14 m long. Over how much area of the field can the horse graze ?

A154 sq m

B308 sq m

C240 sq m

D480 sq m

ramesh ? Jul 2 '2017 at 10:55

Answer is 154 sq m

Explanation:

Area of part grazed by horse = $\frac{1}{4}$

$\therefore$ Required Area = $\frac{1}{4}\pi r^2$

$= \frac{1}{4}*(3.14)*(14^2) = 153.86$

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