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Yogita Ingle 5 years, 9 months ago
Vertices are the corner points. Cubes and cuboids have 8 vertices.
Every individual flat surface of a solid is called its face. Solids have more than one face. Cubes and cuboids have 6 faces.
The line segment which acts as an interface between two faces is called an edge. Sometimes it is also described as the line segment joining two vertices. Cubes and cuboids have 12 edges.
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Gaurav Seth 5 years, 9 months ago
Let ,
The digit in the tens place is x
The digit in the ones place is y
The number is (10x + y)
Form equation 1 :
The sum of the digits is 9
x + y = 9
x = 9 - y
Form equation 2 :
The number is 6 times the units
10x + y = 6y
Put the two equations together:
x = 9 - y -------------------- [ 1 ]
10x + y = 6y -------------------- [ 2 ]
Find y:
Sub [ 1 ] into [ 2 ]:
10(9 - y) + y = 6y
90 - 10y + y = 6y
90 - 9y = 6y
15y = 90
y = 90 ÷ 15
y = 6
Find x:
When y = 6
x = 9 - 6
x = 3
Find the number
The number = 10x + y
The number = 10(3) + 6
The number = 36
Answer: The number is 36
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Pranati Shows 5 years, 9 months ago
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