Question 759058
Ann's age is seven-tenths of Bill's age. In 4 years ann's age will be eigth-elevenths of Bill's age. How old is Bill now?
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let x=Bill's age now
7x/10=Ann's age
In 4 yrs:
x+4=Bill's age
7x/10+4=Ann's age
{{{(7x/10+4)=8(x+4)/11}}}
LCD=110
{{{(77x+440)=80(x+4)}}}
77x+440=80x+320
3x=120
x=40
Bill's age now=40