Question

Afla nr a,b si c stiind ca sunt direct proportionale cu 3; 4 si 7 si suma lor sunt 210.

Answer 1

a/3=b/4=c/7=k

a=3k

b=4k

c=7k

a+b+c=210

3k+4k+7k=210

14k=210

k=210:14

k=15

a=3×15

a=45

b=4×15

b=60

c=7×15

c=105