Question

numerele a si b sunt proportionale cu 5 respectiv 4 .Cat la suta din a reprtezinta b?

Answer 1

a/5=b/4   b=4a/5=80a/100=80%a

Answer 2

a/5=b/4=k
⇒a/5=k⇒a=5k;
⇒b/4=k⇒b=4k;
⇒x/100 ·a=b
⇒x/100 ·5k=4k
⇒x/100=5k/4k
⇒x/100=0,8k
⇒x=100·0,8
⇒x=80[la suta din a reprezinta b];