Grandpa's age is 75 years
Seven times the age of junior = age of grandpa + 9 jears = 75 + 9 = 84 years
Hence, the age of junior will be 84 / 7 = 12 years. (Since 84 is seven times his age, you have to devide by seven).
--> Junior is 12 years old.
I hope I've been helpful, MarkV
Answer:
$1550
Step-by-step explanation:
Given the price of mgCl per ton of metal to be $155, that is;
1 ton of metal = $155
To find the cost of 10 ton of alumininum, we will say;
10 ton of aluminum = x
Equating both expressions;
1 ton of metal = $155
10 ton of aluminum = x (note that aluminum is a metal)
Cross multiply;
1 * x = 155 * 10
x = 1550
Hence 10 tons of aluminum will cost $1550
The 1st number is x and the 2nd number is y:
x = 3y-4
3 + 2x - 2y = 11
The first equation says that x is equal to "3y - 4", so you can plug in "3y - 4" for x in the second equation:
3 + 2(3y - 4) - 2y = 11
3 + 6y - 8 - 2y = 11
-5 + 4y = 11
4y = 16
y = 4
Now that you have y, you can plug it into the 1st equation to get x:
x = 3y - 4
x = 3(4) - 4
x = 12 - 4
x = 8
So, the 1st number is 8 and the 2nd number is 4.
