The principal amount is 
<u>SOLUTION:
</u>
Given that, simple interest 
; 
after 3 years
We have to find the principal.
Now, let the principal amount be p.
Then, 
Now, we know that, Balance = Principal amount + Simple Interest
Answer:
-(7/3) * (3/2) = -21 / 6 = -7 / 2 = -3 (1/2) = -3.5
Step-by-step explanation:
Answer:
3 and -2
Step-by-step explanation:
xy = -6
x + y = 1
let 'x' = y-1
y(y-1) = -6
y² - y + 6 = 0
(y-3)(y+2) = 0
y = 3 and -2
Answer:
Her son is 10 years old.
Step-by-step explanation:
Let son be x
Ellie is 4x
In 5 years time: Her son = x + 5
Ellie = 4x + 5
Given that she will then be 3 times as old as her son: 4x + 5 = 3(x + 5)
Solve x: 4x + 5 = 3(x + 5) ,4x + 5 = 3x + 15
x = 10
