Question

determinati numerele a,b,si c care sunt direct proportionale cu numerele 3,2 si 5 si care verifica relatia 2a+5b+c=210

Answer 1

ai rezolvarea in atașare

Answer 2

k=a/3=b/2=c/5

a=3k

b=2k

c=5k

2*3k+5*2k+5k=210

21k=210

k=210/21

k=10;

a=3*k=3*10=30;

b=2*k=2*10=20;

c=5*k=5*10=50.

Verificam:

2*30+5*20+50=210.

Bafta!