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vy as., , Se Algebra 253, prample 2: The length of a rectangular hal 88 am, , what is its length, if the breadth is by, ) me, , is 5 metres le, > metres less than 3 times the breadth of the hall., olution. Breadth of the hall = 4, , tres?, , Metres,, , As the length of the hall is 5 metr 1, : es le;, , ce jengt = (6 x1b— 5) metres - Ss than 3 times the, , breadth of the ha, sb Sa) menes h of the hall,, , , , Example 3. If Meera’s presented, (i) Meer e 5 years from now,, (ii) Meera’s age 3 years ago., (iii) Meera’s grandfather's age wi, (iv) Meera’s grandmother is2 year, § is 2 years younge} or ori Y i, Me eee younger than her grandfather. What is grandmother’sage?, , e is 5 years more than 3, : i, an 3 times her age. What is hei er’s age?, Solution. Meera’s present age is x years es her age. What is her father’s age, , age ts x years, determine:, , , , , hich is 6 times her age., , (i) Meera’s age 5 years from now = (x + 5) years., (ii) Meera’s age 3 years ago = (x — 3) years \, , ), , (ii) Meera’s grandfather’s age, (iv) Meera’s grandmother’s age = (6x — 2) years, (v) Meera’s father’s age = (3x + 5) years, , , , 6x years., , ample 4. Change the oe A q 5, Example Change the following statement using expressions in a statement in ordinary, language:, Given Salim scores r runs in a cricket match. Nalin scores (¢ + 15) runs.’, Solution. In a cricket match, Nalin scores 15 more runs than Salim., , Exercise 12.3, , 1. Form four expressions with numbers 7, 5 and 8 (no variables) using operations, of addition, subtraction or multiplication with the condition that every number, should be used but not more than once., , 2. Which out of following are expressions with numbers only?, , () 2y +3 (ii) (7 x 20) - 82, (iii) 5 x (21-7) +9 x2 (iv) 5-1n, (v) (6 x 4)-45 +p (vi) 3x (11 + 7) — 24 + 3., , 3. Identify the operations (addition, subtraction, multiplication, division) in forming,, the following expressions and tell how the expressions have been formed:, , ()x+5 (ii) y-7 (iii) 32 (i) 2, (v) 2x +17 (vi) 3y-5 (vii) —7m + : (viii) 2 — 15., 4. Write expressions for the following:, (i) 7 added to p (ii) p subtracted from 7, (iii) p multiplied by 7 (iv) p divided by 7, (v) 7 divided by p (vi) 7 subtracted from —m, , (vii) p multiplied by -5 (viii) —p divided by 5.