Question

numarul natural x care verifica egalitatea:(13* x- 416:4):7=13 reprezinta suma varstelor lui Vlad si Radu.Sriind ca Vlad e mai mare decat Radu cu 3 ani, afla varsta fiecaruia

Answer 1

(13×x-416:4):7=13
13x-416:4=13 ×7
13x-416:4=91
13x-104=91
13x=91+104
13x=195
x=195:13
x=15
V=r+3
v+r=15
r+3+r=15
2r+3=15
2r=15-3
2r=12
r=12:2
r=6
v=r+3=6+3=9
Radu are 6 ani
Vlad are 9 ani

Answer 2

$(13 \times x - 416 \div 4) \div 7 = 13$

$(13x - 104) \div 7 = 13$

$13x - 104 = 13 \times 7$

$13x - 104 =91$

$13x = 91 + 104$

$13x = 195$

$x = 195 \div 13$

$x = 15$

$v + r = x$

$v = r + 3$

$r + 3 + r = x$

$r + 3 + r = 15$

$r + r = 15 - 3$

$2r = 12$

$r = 12 \div 2$

$r = 6$

$v = r + 3$

$v = 6 + 3$

$v = 9$