Question

Determinati a,b,c stiind ca sunt direct proportionale cu 9,11,14, si a plus b plus c = 680

Answer 1

a/9=b/11=c/14=k
a+b+c=680
a/9=k
a=9k
b/11=k
b=11k
c/14=k
c=14k
9k+11k+14k=680
34k=680
k=20
a=9*20=180
b=11*20=220
c=14*20=280
cerific
180+220+280=680