Answer: y=6
Step-by-step explanation:
The given number is y.
According to the question,
Step 1 . subtracts three from the number (y-3), then doubles it
i.e. Final number = 2(y-3)
Step 2 . subtracts three again i.e. (2(y-3)-3), and doubles the number again
i.e. Final result = 2(2(y-3)-3)
If the result is his original number y, then
2(2(y-3)-3) =y
⇒ 2(2y-6-3)=y [ using distributive property]
⇒ 2(2y-9)=y
⇒ 2(2y)-2(9)=y [ using distributive property]
⇒ 4y -18=y
⇒ 4y -y= 18
⇒ 3y= 18
⇒ y= 6 [Divide both sides by 3]
Hence, y=6
<h2>Answer:</h2>
3 ( x - 7 ) = 18
<h3>Explanation:</h3>
Let the number be x, so that
According to the Question,
The difference of a number and 7 will be x - 7
Then, three times the difference of a number and 7 is 18 will be 3 ( x - 7 ) = 18.
Answer:
The tall side
Step-by-step explanation:
Answer:
Step-by-step explanation:
Let x = time (hours) it takes for both
then
x(1/8 + 1/6) = 1
multiplying both sides by 24 (common denominator):
x(3 + 4) = 24
x(7) = 24
x = 24/7
x = 3.429 hours
or
x = 3 hours and 26 minutes
<h2>
Weight of column is 1750.03 pounds</h2>
Step-by-step explanation:
Diameter of column,d = 370 mm = 0.37 m
Length of column, l = 3 m
Volume of column,V = Base area x Length
Volume of column,V = Base area x Length = 0.108 x 3 = 0.324 m³
Density of concrete, d = 2.45 Mg/m³ = 2450 kg/m³
Mass of concrete, m = Volume of column x Density of concrete
Mass of concrete, m = 0.324 x 2450 = 793.8 kg = 1750.03 pounds
Weight of column is 1750.03 pounds
