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(5,0Xn) : n = 5,0
setelahdtambah mirna:
((5,0Xn)+7)/(n+1) = 5,1
5n+7 = 5,1(n+1)
5n+7 = 5,1n+5,1
7-5,1 = 5,1n-5n
1,9 = 0,1n
0,1n = 1,9
n = 19
banyaknya siswa semula adalah
19 siswa
# semoga membantu
# jadikan jawaban terbaik yaa :)