Question

Dan are bile albe si rosii.Jumatate din nr bilelor albe este cu 7 mai mic decat nr bilelor rosii.Dan are 40 de bile albe.Cate bile are Dan in total?

Answer 1

aI------I--I--I-------I
rI-------I--I--I
40-7*2=40-14=26(2 segmente egale)
26:2=13(1 segment)
r=13+7*2
r=13+14
r=27
40+27=67(bile are in total)