Question

Ivan has already prepared 5 kilograms of dough and will continue preparing 8 kilograms of dough every hour. How many hours did Ivan work if he prepared 21 kilograms of dough?

Answer 1

the total dough need to prepare is 21

the dough already prepared is 5

so the remaining dough is 21 - 5 = 16 kg

the rate of dough is 8 dough per hour

so 16/8 = 2

means 16 dough will prepare in 2 hrs

so the time is 2 hrs