Answer:
525 Words i can be typed in 15 minutes.
Explanation:
1. Divide 140 by 4 ( 140 /4 = 35)
2. Multiply 15 by 35 ( 15 x 35 = 525)
3. Make sure that 140/4 is equivalent to 525/15 ( It is ; ) )
Another way to do this ( This is my favorite way)
1. Set 140/4 equal to ?/15
2. Divide 15 by 4 (15/4=3.75)
3. Multiply 140 by 3.75 ( 140 x 3.75 =525 )
4. Plug in 525 (140/4 = 525 /15 )
5. Simplify ( 35 = 35)
If you need me to explain more just tell me.