If David paints houses at the rate of h houses per day, how many houses does he paint in d days, in terms of h and d?

[BTGModeratorVI]

If David paints houses at the rate of h houses per day, how many houses does he paint in d days, in terms of h and d?

A. h/d
B. hd
C. (h + d)/2
D. h - d
E. d/h

Answer: B
Source: Kaplan

[Scott@TargetTestPrep]

If David paints houses at the rate of h houses per day, how many houses does he paint in d days, in terms of h and d?

A. h/d
B. hd
C. (h + d)/2
D. h - d
E. d/h

Answer: B

Solution:

The number of houses David can paint at the rate of h houses per day in d days is h x d = hd.

Answer: B

[Brent@GMATPrepNow]

If David paints houses at the rate of h houses per day, how many houses does he paint in d days, in terms of h and d?

A. h/d
B. hd
C. (h + d)/2
D. h - d
E. d/h

Answer: B
Source: Kaplan

Given: David can paint h houses in 1 day
This means David can paint dh houses in d days [If we multiply the number of workdays by d, the OUTPUT is also multiplied by d]

Answer: B

Cheers,
Brent