Explanation

144/8 = 18 people.

Thus you would need twelve additional people.

Explanation

Let third number is x. Then first no.20%ofx=20x100 Second number=50%ofx=50x100 Percent of first no of second no,=20x10050x100×100=2×10020= 40%

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

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

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

Explanation

LOCKER (6 letters) 6×3 =18 -1 = 17

TRAGEDY (seven letters) 7×3 =21 - 1 = 20.

PREPLANING (Ten Letters) 10 × 3 = 30 -1 = 29