of the candidates who sat for an international mathematics examination, 18% of the candidates obtained grade A, 38% obtained grade B and the rest obtained grade C. Given that 77 candidates obtained grade C, find the total number of candidates whi sat for the examination.​

Jawab:

175

Penjelasan dengan langkah-langkah:

44/100 = 77/X  (44/100 or 44% equals to 77 people per X people)

0,44/77 = 1/X  (0,44 is 44 divided by 100, then 77 pindah ruas)

77/0,44 = X  (ruasnya dibalik agar mendapat nilai X)

175 = X  (Hasilnya 175, jadi 44% dari 175 adalah 77)

jadi keseluruhan kandidat yang duduk pada ujian matematika international berjumlah 175

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