Let's assume
number of dimes in coin as 'd'
number of quarters in coin as 'q'
we are given
total number of coins is 16
so, we get
we know that
1 dime =$0.10
1 quarter=$0.25
we have
he has $2.20 in his pocket
so, we get equation as
so, we get system of equation as
Firstly, we will solve for q from first equation
now, we can plug back q
now, we can solve for d
now, we can solve for q
so,
number of dimes coins are 12
number of quarter coins are 4...........Answer