Age Product Great Grandfather

Monica was born on the day his great-grandfather turned 90. If the product of their age is 1000, how old is Monica?

Final Answer:

m =  10

Step-by-step explanation:

m(m+90)=1000  m2+90m1000=0  a=1;b=90;c=1000 D=b24ac=90241(1000)=12100 D>0  m1,2=2ab±D=290±12100 m1,2=290±110 m1,2=45±55 m1=10 m2=100  m>0 m=m1=10

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You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem

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