Kirstie bought 524 bobby pins. she used 220 bobby pins for her morning appointments. then, she got 200 bobby pins from her co-worker. how many bobby pins does kirstie have now?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

The architect's side view drawing of a saltbox-style house shows a post that supports the roof ridge. the support post is 8 ft tall. the distance from the front of the house to the support post is less than the distance from the post to the back of the house. how far from the front of the house is the support post positioned?

Walking at a constant rate of 8 kilometers per hour, juan can cross a bridge in 6 minutes. what is the length of the bridge in meters?