Question 25803
Let x=ribbons that cost .15
then {{{3/4}}}x=ribbons that cost .20
so we have;
.15x+.20{{{(3/4)}}}=1.20
.15x+.15x=1.20
.30x=1.20
x=4
So the ribbons that cost .15 is 4;
and the ribbons that cost .20= {{{3/4}}}(4)=3
Hope you understand
=)