A college clock tower (perpendicular to the ground) casts a shadow tha

(1) The height of the tower is 1/3 greater than the length of its shadow.............from this we will get the second side.....from which we can findthe third side.........SUFFICIENT

(2) If the tower were to sink into the ground so that only half of its original length remained above ground, the tower would cast a shadow 60 meters long............This repeats the given information.............so INSUFFICIENT

OA:A

A college clock tower (perpendicular to the ground) casts a shadow that is 120 meters long. What is the distance from the top of the tower to the farthest tip of its shadow?

Let Tower height = x
Base (shadow length) = 120
Basically, we have to find the hypotenuse of the right angled triangle formed by the tower and its shadow. Since only shadow length is given, it is to be seen whether it has any form of relation with either tower height or hypotenuse.

(1) The height of the tower is 1/3 greater than the length of its shadow.
\(x = 120 + \frac{1}{3} * 120\)
Since, x can be found hypotenuse can be found.

SUFFICIENT.

(2) If the tower were to sink into the ground so that only half of its original length remained above ground, the tower would cast a shadow 60 meters long.
Let half of tower height = y
new shadow length = 60
No relations among them is available. The statement simply sales down the original and gives nothing new to help find the answer. Hence

INSUFFICIENT.

Answer A.

We are given the length of the shadow cast by the tower as 120m. We are to determine the distance,x, from the top of the tower to the end of the shadow. In other words, x is the hypotenuse of the right-angled triangle formed by the tower and the end of its shadow.

Based on the information given, if we know the angle of elevation,Z, from the end of the shadow cast by the tower to tip of the tower, we can easily determine x, as shown below:
cosZ=120/x, hence x=120/cosZ .........................(1)

Likewise, we can determine x if we know the height of the tower, h. With h known, x can be determined as follows:
x=(h^2 + 120^2)^0.5 .....................................(2)

1. The height of the tower is 1/3 greater than the length of its shadow.
Statement 1 sufficient since we can determine the height of the tower from the information above and substitute it into equation (2) in order to determine x, the distance from the furthest tip of the shadow to the top of the tower.
h=120+1/3 * 120 = 160m

(2) If the tower were to sink into the ground so that only half of its original length remained above ground, the tower would cast a shadow 60 meters long.
This is not sufficient because the given information does not provide any additional information that can help us to determine the height of the tower nor the angle of elevation to the top of tower from the furthest tip of the shadow.

The answer is option A.

(1) The height of the tower is 1/3 greater than the length of its shadow. sufic

\(x^2=h^2+(120)^2…h=4/3(120)…x^2=(4*120/3)^2+120^2\)

(2) If the tower were to sink into the ground so that only half of its original length remained above ground, the tower would cast a shadow 60 meters long. insufic

Ans (A)

One of the legs in right—angled triangle is 120 meters
—>We need to find the hypotenuse of the triangle???

(Statement1):
The height = (1/3)*120+ 120 = 160

—> the hypotenuse^{2} 120^{2}+160^{2}
Hypotenuse= 200
Sufficient

(Statement2): we got two similar right-angled triangles.
—> but there is info about just one leg of both triangles. We need additional info to get this question done.
Insufficient

The answer is A

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