Question

Gorge planteaza in 5 zile 105 panselute.In fiecare zi, incepand cu a doua George planteaza cu 4 panselute mai multe decat in ziu precedenta.In a cata zi numarul panselutelor plantate in ziua respectiva este patrat perfect??

Answer 1

1 zi , planteaza x
2 zi, x+4
3 zi , x+8
4...x+12
5...x+16

x+x+4+x+8+x+12+x+16=105
5x+40=105
x=13

1 zi.  13 panselute
2 zi.  17 panselute
3.      21 panselute
4.      25 panselute
5.      29 panselute

in a 4 zi planteaza patrat perfect 5*5=25