Answer:

elder sister of of 7 is 17 and younger brother of 19 is 9

The elder sister of [tex]7[/tex] is [tex]17[/tex] and the younger brother of [tex]19[/tex] is [tex]9[/tex].

Given: The elder sister of [tex]5[/tex] is [tex]15[/tex] and the younger brother of [tex]15[/tex] is [tex]5[/tex].

To find: Who is the elder sister of [tex]7[/tex] and  Who is the younger brother of [tex]19[/tex]?

Solution:

• We are given that the elder sister of [tex]5[/tex] is [tex]15[/tex], and the younger brother of [tex]15[/tex] is [tex]5[/tex] and we should use this information to find the answers to the questions required.
• As the elder sister of [tex]5[/tex] is [tex]15[/tex] we can infer that the number [tex]10[/tex] is added to [tex]5[/tex] to get the age of the elder sister.
• We should do the same to [tex]7[/tex] to get the age of the elder sister which is [tex]17[/tex].
• Similarly, we are given that the younger brother of [tex]15[/tex] is [tex]5[/tex].
• This means that the number [tex]10[/tex] is subtracted from [tex]15[/tex] to get the age of the younger brother.
• We should also do the same to [tex]19[/tex] to get the age of the younger brother which is [tex]9[/tex].
• Therefore from the above, we can infer that  The elder sister of [tex]7[/tex] is [tex]17[/tex] and the younger brother of [tex]19[/tex] is [tex]9[/tex].

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