Berikut ini adalah pertanyaan dari 212207002 pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Atas
Jawaban dan Penjelasan
Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.
Jawab:
Let's call the age of Jia Jia in 2013 as x. Then, the age of Kai Kai in 2013 would be 11 - x.
In 2022, Kai Kai will be 3 times as old as Jia Jia was in 2013, so his age in 2022 would be 3 * x + 9 (9 years have passed).
Since the sum of their ages in 2022 is 3 * x + 9 + x = 4 * x + 9, and they both had an age of 11 in 2013, we can set up the following equation to solve for x:
4x + 9 = 11 + 9 = 20
4x = 11
x = 11/4 = 2.75
So Jia Jia was 2.75 years old in 2013, and Kai Kai was 11 - 2.75 = 8.25 years old in 2013. In 2014, Jia Jia would be 2.75 + 1 = 3.75 years old and Kai Kai would be 8.25 + 1 = 9.25 years old.
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Last Update: Tue, 09 May 23