If a and b are two non-zero numbers and if 69(a+b) = (69+a)b, then which of the following must be true?
- a=69
- a+b=ab
- b=69
- a<1
Explanation
69(a+b) = 69a+69b (by descriptive law)
(69+a)b = 69b+ ab
then,
69a+69b = 69b + ab
69a = ab
b = 69 (dividing both sides by a)
*****
ND1-1-2023
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