Question 472991
Let {{{w}}} = the week when the baby is 12 pounds
The formula would be:
{{{ 12 = .2w + 7.2 }}}
{{{ .2w = 12 - 7.2 }}}
{{{ .2w = 4.8 }}}
{{{ w = 24 }}}
Let {{{w}}} = the week when the baby is 20 pounds
{{{ 20 = .2w + 7.2 }}}
{{{ .2w = 12.8 }}}
{{{ w = 64 }}}
{{{ 24 < w < 64 }}}