Question

Media aritmetica a trei numere este egala cu 16. Aflati numerele, stiind ca ele sunt direct proportionale cu numerele 4, 5 ,7

Answer 1

a/4=b/5=c/7=k

a=4k

b=5k

c=7k

a+b+c/3=16

4k+5k+7k/3=16

16k/3=16

16k=3×16

k=3

a=4×3

a=12

b=5×3

b=15

c=7×3

c=21

Answer 2

(a+b+c):3=16
a+b+c=16x3
a+b+c= 48
a=4k
b=5k
c=7k
a+b+c=48
4k+5k+7k=48
16k=48
k=3
a=4x3=12
b=5x3=15
c=7x3=21