John's present age is 15 years.
His sister's present age is 10 years.
<u>Step-by-step explanation</u>:
step 1 :
Let,
step 2 :
The product of their present ages is 150.
⇒ x(x+5) = 150
⇒ x^2 +5x -150 =0
step 3 :
Using factorization method,
product of the roots (-1015) = -150
Sum of the roots (-10+15) = 5
∴ The values of x are x=10 and x=-15.
Age cannot be negative.
So, the present age of sister is 10 years.
The present age of John = x+5 = 15 years.
Answer:
I can't understand your question. what is the meaning of these 3, 4 ,16 in your question
18
Step-by-step explanation:
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 18 are 1, 2, 3, 6, 9, 18
The common factors are 1, 2, 3, 6, 9, 18
The greatest common factor = 18
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