Question 189619
Let {{{x}}}= the number of years in which Peter will be
a quarter of his grandfather's age
Given:
{{{12 + x = (1/4)*(63 + x)}}}
{{{48 + 4x = 63 + x}}}
{{{3x = 63 - 48}}}
{{{3x = 15}}}
{{{x = 5}}}
In 5 years, Peter will be
a quarter of his grandfather's age
check:
{{{12 + x = (1/4)*(63 + x)}}}
{{{12 + 5 = (1/4)*(63 + 5)}}}
{{{17 = (1/4)*68}}}
{{{68 = 68}}}
OK