Question

afla suma numerelor a b c d stiind ca a=dublul lui d b=cu 161 mai mic decat a c=86 d= de doua ori si jumatate mai mare decat c

Answer 1

a+b+c+d = ? a=2d       ⇒  a= 2 ·215 ⇒      a= 430
                     b=a-161  ⇒ b= 430-161 ⇒    b = 269
                     c= 86                                     c=86
                     d= 2.5 ·c  ⇒ d=2.5·86  ⇒      d=215
                                                              --------------
                                         a+b+c+d = 430+269+86+215 = 1000