Explanation

Let side of the square = a

Area = a 2

 ∴ new side = 3a

Hence, new area = (3a)

2 =9a 2 Precentage increase in area = 

a 2 9a 2−a 2 ×100=800%

Explanation

When we use ( pen) to write, we use ( ink) instead of (pen). Then we have to use the preposition ( in ) but not ( with).

eg. I write in ink.

When we use pencil, we have to use ( with) but not ( in).

eg. I wrote with a pencil.

Explanation

Let the number be x Then, x+17=60x⇒x2+17x−60=0⇒(x+20)(x−3)=0⇒x=3

Explanation

When the reported clause of a direct speech is a universal truth or any historical event or a habitual action (a part of the daily routine), then the tense of the indirect speech doesn’t change, no matter in whatever tense the reporting verb (say) is.

Explanation

Speed (v) of train = 60 km/hr. And it takes 9 seconds to cross a pole. Therefore, time (t) = 9 seconds. Now as we know 1 km = 1000 meter. And 1 hr. = 3600 sec. So 1(km/hr.) = (1000/3600) = (5/18) meter/seconds So 60 km/hr. = 60×(5/18)=503 m/sec. So the speed (v) of the train = 503 m/sec. Now as we know speed (v), distance (s) and time (t) is related as s=v×t Units. Now let the length of the train be l m. ⇒l=v×t Meters. Now substitute the values in above equation we have, ⇒l=503×9=150 Meters.           

Explanation

While reporting imperative sentences we use reporting verbs like ask, request, beg, order, advise, wish etc to match the mood of the sentence.

Explanation

When a Plural Noun (A hundred rupees) denotes some specific quantity/amount considered as a whole, the Verb is generally Singular.

Explanation

A poor man whom I knew nursed the orphan means وہ غریب جس کو میں جانتا تھا اس نے یتیم کی دیکھ بھال کی تھی۔

Explanation

Let the number be x

Then,

⇔23x−50=14x+40⇔23x−14x=90⇔5x12=90⇔x=(90×125)⇔x=216

Explanation

Let numbers are x and y

⇒x−y=5

xy=336

Now using identity

(x+y)

2

 =(x−y)

2

 +4xy

=25+4(336)

=25+1344

=1369

⇒x+y=37