Question

1. malcolm wants to surprise his mother with a birthday cake when she gets home from work. she gets home from work at 4:00 p.m. he needs to make the cake batter, which will take 10 minutes; bake the cake, which will take 35 minutes; let it cool for 20 minutes; and then put the icing on, which will take 20 minutes. what time should malcolm start making the cake to be sure it is finished when his mother gets home from work at 4:00 p.m.?

○ 2:15 p.m.

○ 2:35 a.m.

○ 2:15 a.m.

○ 2:35 p.m.

Explanation:

Step1: Calculate total time needed

First, we sum up all the time intervals: making batter (10 min), baking (35 min), cooling (20 min), and icing (20 min). So total time $= 10 + 35 + 20 + 20 = 85$ minutes. Since 60 minutes make an hour, 85 minutes is 1 hour and 25 minutes.

Step2: Subtract total time from 4:00 p.m.

We need to find the start time by subtracting 1 hour and 25 minutes from 4:00 p.m. Subtracting 1 hour from 4:00 p.m. gives 3:00 p.m. Then subtracting 25 minutes from 3:00 p.m. gives 2:35 p.m.

Answer:

D. 2 : 35 p.m.