Question

405-(9х+70):4=385
1800:(240:у)-47=253

Answer 1

1) 1620-(9x+70)=1540
1620-9x-70=1540
1550-9x=1540
-9x=1540
x=10/9

2) 1800÷(240÷y)-47=253
1800×y/240 -47=253
15×y/2-47=253
15y-94=506
15y=600
y=40