If sum of two numbers is 30 and their difference is 8, What is their product?
A. 209
B. 201
C. 202
D. 176
If sum of two numbers is 30 and their difference is 8, What is their product?
Solution:
If sum of two numbers is 30 i.e
11+19=30
And their difference is 8 i.e
19-11=8
So, their product is 11×19=209 Answer
Other Method
If x+y= 30
& x-y= 8
Then by solving these equations numbers (x&y) are 11 & 19
then their product will be 209
then their product will be 209
Another Method
Suppose the number is x, now as given their difference is equal to 30 i.e
x-8=30
So, their sum will be as given
x + x-8=30
Now, simple solve the equation
2x=30+8
2x=38
x=19
Now, you can easily find second number
30-19=11
Hence, their product is
19*11=209
