👤

Calculati a×b stiind ca a+b=150 si a=25% din b

Răspuns :

a + b = 150
a = 25b/100
25b/100 + b = 150
b/4 + b = 150
b + 4b = 600
5b = 600
b = 600 : 5
b = 120
a = b/4
a = 120/4
a = 30
a * b = 30 * 120 = 3600
a+b=150
a=25%b=b/4

b/4+b=150
b+4b=600
5b=600
b=120
a=30
a·b=30·120=3600