Răspuns :
6 + 9 + 12 + 18 = 45 ani
90 : 45 = 2 bomboane
6 * 2 = 12 bomboane primul
9 * 2 = 18 bomboane al doilea
12 * 2 = 24 bomboane al treilea
18 * 2 = 36 bomboane al patrulea
12 + 18 + 24 + 36 = 90 bomboane total
90 : 45 = 2 bomboane
6 * 2 = 12 bomboane primul
9 * 2 = 18 bomboane al doilea
12 * 2 = 24 bomboane al treilea
18 * 2 = 36 bomboane al patrulea
12 + 18 + 24 + 36 = 90 bomboane total
a/6=b/9=c/12=d/18=(a+b+c+d)/(6+9+12+18)=90/45=2
a/6=2, a=12
b/9=2, b=18
c/12=2,c=24
d/18=2, d=36
12+18+24+36=90
a/6=2, a=12
b/9=2, b=18
c/12=2,c=24
d/18=2, d=36
12+18+24+36=90