Question
A number is decreased by 15 and the new number so obtained is multiplied by 3; the result is 81. Find the number. [3 MARKS]
Answer:
:
Equation: 1 Mark
Steps: 1 Mark
Answer: 1 Mark
Let the number be x.
The number decreased by 15 ⇒(x−15)
The number so obtained is multip[lied by 3⇒3×(x−15)
Given: 3(x−15)=81⇒3x−45=81
⇒3x=81+45
⇒x=1263=42
∴ The required number = 42
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:
Equation: 1 Mark
Steps: 1 Mark
Answer: 1 Mark
Let the number be x.
The number decreased by 15 ⇒(x−15)
The number so obtained is multip[lied by 3⇒3×(x−15)
Given: 3(x−15)=81⇒3x−45=81
⇒3x=81+45
⇒x=1263=42
∴ The required number = 42
Was this answer helpful ?
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