Help with math don’t get it ?

Joshua buys a new TV for $170. He pays for the TV with ten and twenty dollar bills, and uses a total of 11 bills to purchase the TV. How many of each kind of bill did Joshua use to pay for the TV?

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  • Como
    Lv 7
    1 month ago

    Let x be number of 10 dollar bills

    And y be number of 20 dollar bills

    x + y = 11

    10x + 10y = 110

    10x + 20y = 170

    10 y = 60

    y = 6

    x = 5

    5 , ten dollar bills

    6 , 20 dollar bills

  • 1 month ago

    If you are supposed to use algebra:

    Let x = number of tens,

    Let y = number of twenties

    x + y = 11 (there are 11 total pieces of paper)

    10x + 20y = 170 (10 times the number of tens plus 20 times the number of twenties = the amount of money)

    Simplify that by dividing by ten.in

    x + 2y = 17

    Subtract x + y = 11 from.that

    y = 6

    So x = 11 -6 = 5

    Check 5(10) +6(20) = 50+120 = 170 checks

  • Anonymous
    1 month ago

    If he uses 'x' ten dollar bills and 'y' twenty dollar bills:

    x + y = 11 (total of eleven bills)

    10x + 20y = 170 (total cost is $170)

    Then solve the simultaneous equations:

    x = 11 - y

    10(11 - y) + 20y = 170

    110 - 10y + 20y = 170

    10y = 60

    y = 6 (six twenty dollar bills)

    x = 11 - 6 = 5 (five ten dollar bills)

  • 1 month ago

    If they were all 10s, that would take 17

    3 20s, that is 3+11

    4 20s, that is 4+9

    5 20s, that is 5+7

    6 20s, that is 6+5 = 11 ⬅

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