Question 44695
#60) In Anna's purse there are 11 coins consisting of nickels and dimes.If the total value of these coins is $0.95,how many of each type of coin are there? 
Let number of nickels be "x"
Then number of dimes is "11-x"
Value of the nickels is 5x cents
Value of the dimes is 10(11-x)=110-10x cents

EQUATION:
value + value = 95 cents
5x+110-10x=95
-5x=-15
x=3 (number of nickels)
11-x=8 (number of dimes)
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#61) A bank customer withdraws $200 from her account in $10 and $20 bills.she requests twice as many $20 as $10 bills.How many of each kind of bill does she receive?
Let the number of $10 bills be "x"
Then number of $20 bills = 2x
Value of the $10 bills is 10x dollars
Value of the $20 bills is 20(2x)=40x dollars

EQUATION:
value + value = $200
10x + 40x = 200
50x = 200
x=4 (number of $10 bills)
2x=8 (number of $20 bills)

Cheers,
Stan H.