Network
4. The average (arithmetic mean) of three numbers is 20. If one of numbers is replaced by the number 45 then the average of the three numbers is 25. The original number that was replaced is... .
5. Suatui fungsi f(2x + 3) = 3x – 5. Nilai dari f(–5) = ... .
KUNCI JAWABAN
1. 3/4
2. 40 boneka
3. 2^2019 (tanda ^ dibaca pangkat)
4. 30
5. -17
Berikut Pembahasannya:
1. Misalkan bilangan I adalah a
Bilangan II adalah b
Maka
a – b = 1
a + b = 2 +
2a = 3
a = 3/2
a – b = 1
3/2 – b = 1
b = 1 – 3/2
b = 1/2
