A ribbon measuring (v+4) feet in length was cut into 2 pieces in the ratio 3:7. What was the length of the longer piece?
[ 7 / (7+3) ] * original length
which is
0.7 * original length
0.7(v+4) = 0.7 c + 2.8
which is
0.7 * original length
0.7(v+4) = 0.7 c + 2.8