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A man was asked to multiply a number by 21 but he multiplied the number by 12, by which resultant was 198 less than the actual value. Find the number?1. 182. 223. 324. 10 |
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Answer» Correct Answer - Option 2 : 22 Given: Number is multiplied by 12 instead of 21 Resultant = Actual value – 198 Formula Used: Actual value = Resultant + difference between actual value and resultant value Calculation: Let the number be n Actual value = 21 × n = 21n ⇒ Resultant = n × 12 ⇒ Resultant = 12n 21n = 12n + 198 ⇒ 21n – 12n = 198 ⇒ 9n = 198 ⇒ n = 198/9 ⇒ n = 22 ∴ The number is 22 |
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