Răspuns: 600
Explicație pas cu pas:
12% = 12/100 = (12:4)/(100:4)=3/25
50%= 50/100 = 1/2
Notez numarul cu ,,a"
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12% × 50% × a = 36
(3/25) × ( 1/2) × a = 36
3×a / 50 = 36
3 × a = 36 × 50 l : 3
a = 12 × 50
a = 600 → numarul
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Sau:
( 12/100) × ( 50/100) × a = 36
( 12/100 ) × a/2 = 36
12 × a = 200 × 36 l : 12
a = 200 × 3
a = 600 → numarul
