Question

Kathy can key in 6 letters every 3 seconds on her phone. How many letters can she type in a minute and a half?

Answer 1

She can type 180 letters in a minute and a half.

Explanation:

6 letters per 3 seconds, so we need to find how many letters per 90 seconds, or minute and a half.

6/3 = x/90

Where x represents how many letters she can type in 90 seconds.

2 = x/90

Multiply by 90.

x = 180.

Answer 2

Kathy can type 180 letters