A boy is Y years old. His father is twice as old as he is. The sum of their ages is 63. How old is the boy?
2 answers:
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Answer:
a₂ = - 28.5
Step-by-step explanation:
the nth term of an arithmetic sequence is
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = - 45 and given a₃ = - 12 , then
a₁ + 2d = - 12 , that is
- 45 + 2d = - 12 ( add 45 to both sides )
2d = 33 ( divide both sides by 2 )
d = 16.5
Then
a₂ = a₁ + d = - 45 + 16.5 = - 28.5
Answer:
1.042% of the total tickets sold 1 child ticket.
Step-by-step explanation:
As given,
A Water park sold 72 child tickets and 24 adult tickets.
So,
The total number of ticket sold by a Water park = Total child ticket sold + Total adult ticket sold
⇒The total number of ticket sold by a Water park = 72 + 24 = 96
Now,
The total child ticket sold = ×100% = 0.75×100% = 75%
Now, we get
72 child ticket sold % = 75
⇒ 1 child ticket sold % = = 1.042%
So, we get
1.042% of the total tickets sold 1 child ticket.