Question 67646
Letx=number of nickels
Then 200-x=number of dimes


Now lets deal in pennies to keep down confusion.

We are told that:

5x+10(200-x)=1400  all in pennies;  divide each term by 5

x+2(200-x)=280  clear parens

x+400-2x=280  subtract 400 from both sides
-x=-120
x=120----------------------number of nickels

200-x=200-120=80-------------number of dimes

ck

120(5)+80(10)=1400

600+800=1400
1400=1400


Hope this helps----ptaylor