Ex 11.4, 3 (b) Given Sara’s age today to be y years. Think of her age in the future or in the past. What will the following expression indicate? y + 7, y – 3, y + 4 1/2 , y – 2 1/2Given,
Sara’s age = y years
(y + 7) years is an age larger than Sara’s age
So, (y + 7) years can be Sara’s age after 7 years from now.
(y − 3) years is an age smaller than Sara’s age
So, (y − 3) years can be Sara’s age before 3 years from now.
("y + 4 " 𝟏/𝟐) years is an age larger than Sara’s age
So, ("y + 4 " 1/2) can be Sara’s age after 4 years and 6 months from now.
("y − 2 " 𝟏/𝟐) years is an age smaller than Sara’s age
So, ("y − 2 " 1/2) can be Sara’s age before 2 years and 6 months from now

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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