Ravens

The tale of the Seven Ravens were seven brothers, each of whom was born exactly 2.5 years after the previous one. When the eldest of the brothers was 2-times older than the youngest, mother all curse. How old was seven ravens brothers when their mother cursed?

Correct result:

k1 (youngest) =  15
k2 =  17.5
k3 =  20
k4 =  22.5
k5 =  25
k6 =  27.5
k7 (oldest) =  30

Solution:

${k}_{2}={k}_{1}+2.5=17.5$
${k}_{3}={k}_{2}+2.5=20$
${k}_{4}={k}_{3}+2.5=22.5$
${k}_{5}={k}_{4}+2.5=25$
${k}_{6}={k}_{5}+2.5=27.5$
${k}_{7}={k}_{6}+2.5=30$

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