Question

afla 2/5 din a+b+c daca a reprezinta 7/10 din 150,b reprezinta 7/5 din 120, iar 4/10 din ceste 40

Answer 1

a=7/10×150=7×150/10=7×15=105
b=7/5×120=7×120/10=7×12=84
c=4/10×40=4×40/10=4×4=
=16
a+b+c=105+84+16=205
2/5×205=2×205/5=410/5=
=82