Ajar contains n nickels and d dimes. there are 30 coins in the jar, and the total value of the coins is $2.15.
set up and solve a system of equations to find how many nickels and how many dimes are in the jar.
0.05n +0.100 =
n+d=
there are
nickles and
dimes.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)