TCS Company Numerical Ability Geometry

The figure below shows a “size 3” equilateral triangle divided up into 9
“size 1 “equilateral triangles. The figure has 6 upward facing and 3 downward facing “size1”equilateral triangles, 3 upward facing and no downward facing
“size 3 “ triangle. It has a total of 13 equilateral triangles of all sizes.

The following size 6 triangle is divided up in the same way. What is the sum of the number of up facing size 2 triangles and the number of upward facing size 4 triangles?

Read Solution (Total 4)

up facing size 2 triangles = 15
up facing size 4 triangles = 6
sum=21
8 years agoHelpfull: Yes(6) No(4)

a)27 b)17 c)18 d)19 there is no 21 in option ,,, plz tel correct answer
8 years agoHelpfull: Yes(1) No(0)
there is no option as 21....so,please tell the correct ans..
7 years agoHelpfull: Yes(0) No(1)
Solution : 18
Size 3 is divided into 6 upward facing size1 triangle and as it has 13 equilateral triangle it is obvious that there are 3 size to triangle in it
Thus in size 6 triangle there are 6 size 4 triangle

size 3 triangle has 6 (i.e.,3*2) size1 upward facing triangle
thus size 6 triangle has 6*2=12 size 2 triangle

Therefore 6+12=18.
7 years agoHelpfull: Yes(0) No(2)

TCS Other Question

Three generous friends, each with some money, redistribute the money as follows: Sandra gives enough money to David and Mary to double the amount of money each has. David then gives enough to Sandra and Mary to double their amounts. Finally, Mary gives enough to Sandra and David to double their amounts. If Mary had 11 rupees at the beginning and 17 rupees at the end, what is the total amount that all three friends have? In subtraction problem below, some single digits (not necessarily distinct) are replaced by letters. Find the value of 7*A+5*B+6*C*D
A 5 C 5
-1 B 8 7
_______
6 7 4 D