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tikirawallace
21.01.2020 •
Mathematics
:sam is 12 years older than john. for the last four years, sam and john have been friends. five years ago, sam was 5 times as old as john. how old is sam now?
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Ответ:
The present age of Sam is 20 years .
Step-by-step explanation:
Given as :
Let The age of John = J years
Let The age of Sam = S years
∵ Sam is 12 years older than John
so, The age of Sam = 12 + The age of John
i.e S = 12 + J .....1
Again
Before 5 years ago
The age of Sam = 5 times age of John
So, (S - 5) = 5 × (J - 5)
Or, S - 5 = 5 J - 25
Or, 5 J - S = 25 - 5
Or, 5 J - S = 20 .........2
Solving eq 1 and eq 2
[5 J - (12 + J)] = 20
Or, 5 J - 12 - J = 20
Or, 4 J = 20 + 12
Or, 4 J = 32
∴ J =![\frac{32}{4}](/tpl/images/0463/5310/3d8b2.png)
i.e J = 8 years
So, The age of John = J = 8 years
Put The value of J into eq 1
∵ S = 12 + J
So, S = 12 + 8
i.e S = 20 years
So, The present age of Sam = S = 20 years .
Hence, The present age of Sam is 20 years . Answer
Ответ:
Sam is 20 years old now.
Step-by-step explanation:
Given:
Sam is 12 years older than John.
For the last four years, Sam and John have been friends.
Five years ago, Sam was 5 times as old as John.
Now, to find the age of Sam now.
Let the age of Sam be![x.](/tpl/images/0463/5310/553ae.png)
And the age of John be![y.](/tpl/images/0463/5310/66471.png)
As, Sam is 12 years older than John.
Thus,
.....( 1 )
Now, to get the age:
According to question:
Now, substituting the value of equation (1) in equation (2) we get:
Getting the variables in one side and numbers on the other we get:
Dividing both sides by 4 we get:
The age of John = 8 years.
Now, putting the value of
in equation (1) we get:
Age of Sam = 20 years.
Therefore, Sam is 20 years old now.
Ответ:
Step-by-step explanation:
1) ABCD is a trapezium. AB ║ CD
∠ADC + ∠DAB = 180° { Co interior angles}
110° + ∠DAB = 180
∠DAB = 180 -110
∠DAB = 70°
2) Sum of all angles of trapezium = 360°
∠A + ∠B + ∠DCB + ∠D = 360
70° + 50° + ∠DCB + 110° = 360
230 + ∠DCB = 360
∠DCB = 360 - 230
∠DCB = 130°
3) For finding the height, use Pythagorean theorem
height² + base² = hypotenuse²
height² + 6² = 10²
height² + 36 =100
height² = 100 - 36
height² = 64
height = √64
height = 8 m
4) a = AB = x m
b = 9 m
h = height = 8 m
Area of trapezium = 120 m²
x + 9 = 120/4
x + 9 = 30
x = 30 - 9
x = 21 m
AB = 21m