红墨水瓶数x
蓝墨水瓶数x*4/5=4x/5
x-30=4x/5*(1-25%)
x-30=3x/5
2x/5=30
x=75
x*4/5=75*4/5=60
红墨水瓶数75, 蓝墨水瓶数60