Question

o camila parcurge in prima zi 1/4 din drum, in a doua 1/2 din rest si in ultima 25km. Ce lungime are drumul? Dau coroana.

Answer 1

notezi cu x drumul, rezulta
x/4+(3x/4)/2+25=x, sau x/4+3x/8+25=x, sau 2x+3x+200=8x, sau 3x=200, x=200:3

Answer 2

x ------>lungimea drumului
1/4 din x -------->1/4 * x =x/4 ---->prima zi
x(4-----x/4 =4x-x supra 4 tot---->3x supra 4----->restul
1/2 din 3x/4 =1/2 x 3x/4 ---->3x/8----->a doua zi
3x/4(2---->3x/8=6x-3x totul supra 8---->3x/8---->noul rest
3x/8=25
x=8x25 tot supra 3
x=200/3
x=66,6