Question

It takes 15 minutes to bake one batch of cookies in Donald's oven. If he starts baking at 9 in the morning, then he can bake batches by 7:45 p.m.

• A. 43
• B. 33
• C. 40

Answer 1

The correct option is A 43

Time at which Donald starts baking
= 9 a.m.

Time at which Donald stops baking
= 7:45 p.m.

Time available for baking
= (12 − 9) h + 7 h + 45 min
= 10 h 45 min
= (10$\times$ 60) min + 45 min

($\because$ 1 h = 60 min)

= 600 min + 45 min
= 645 min

Time taken to bake one batch
= 15 min

$⟹$ Number of batches that can be baked

$=\frac{\text{Total time available}}{\text{Time taken to bake one batch}}$

$=\frac{645\text{min}}{15\text{min}}$

$=43$

Thus, Donald can bake 43 batches by 7:45 p.m. if he starts at 9 in the morning.