Q14
The sum of two number is 25 and their difference is 13. Find their product.
A.
104
B.
114
AnswerC.
315
D.
325
Answer: Option B
Solution
Answer: Option B
Solution:
Let the numbers be x and yThen, x + y = 25 and x - y = 13
4xy = (x + y)2 - (x- y)2
= (25)2 - (13)2
= (625 - 169)
= 456
∴ xy = 114