Question

Afla a,b daca: a•b=240 si a•(b+5)=300

Answer 1

a•(b+5)=300
ab+5a=300
dar stii ca ab=240
deci 240+5a=300
5a=300-240
5a=60
a=60/5
a=12
ab=240
12b=240
b=240/12
b=20