Question

Calculati:
$2 \frac{4}{5}$ : $(1 \frac{3}{4} + \frac{7}{10} )$

Answer 1

2 4/5:(1 3/4 +7/10)=
=14/5 :(7/4+7/10)=
=14/5 :(7×5+7×2)/20=
=14/5 :(35+14)/20=
=14/5 × 20/49=
=8/7