Identify the kind of contract described. Jack and Jill, up and coming young fashion designers, buy shop premises in Bath, with the aid of loan secured on the property from their

(900-х:6)х5=4200

900-х:6=4200:5

900-х:6=840

х:6=900-840 

х:6=60

х=60х6

х=360

 проверка:

(900-360:6)х5=4200- верно

325+(90-n):17 =330

(90-n):17=330-325

(90-n):17=5

90-n=5х17 

90-n=85

n=90-85

n=5

проверка:

325+(90-5):17=325+5=330- верно