Natasha received 15 coins from her mom for cleaning her room. Some coins were quarters and others were dimes. If she earned $1.95, how many of the coins were dimes? Natasha received 15 coins from her mom for cleaning her room. Some coins were quarters and others were dimes. If she earned $1.95, how many of the coins were dimes? @Mathematics

Question

btaylor · Answer

create a system: 
d + q = 15 --> q = 15-d
10d+25q=195 --> 10d + 25(15-d) = 195 -->10d+375-25d=195 --> -15d=-180
d=12 --> q=3