Question

ex 64! Ajutor dau coroana! Urgent! Cu rezolvare!

Answer 1

20 / 100 · a = 80 / 100 · b
a / 5 = 4b / 5
a = ( 4b · 5 ) / 5
a = 4b
a² + b² = 17
(4b)² + b² = 17
17b² = 17 ⇒ b² = 1 ⇒ b = 1
a = 4b ⇒ a = 1 · 4 ⇒ a = 4
p / 100 · a = b
p / 100 · 4 = b
p / 25 = 1 ⇒ p = 25%