Question

Evan has $0.45 worth of pennies and nickels. He has a total of 21 pennies And Nickels All together. Determine the number of pennies in the number of nickels that Evan has.

Answer 1

first of all you to multiple the decimal number by 100 to get a normal number.

o.45 . 100 = 45

x = number of pennies

y =number of nickels

x+y= 21

1x + 5y = 45

x+ y= 21

y = -x+ 21

1x+ 5( -x+21)=1x-5x+105= -4x+105

105 % -4= the number of x

to find the number of y you have to minus the number of x from 21.

Explanation: