Question 11

If the sum of three consecutive numbers is 15, what is the square of the middle number ?

Solution

Let the three consecutive numbers be $$(x-1),(x),(x+1)$$

Sum = $$(x-1)+x+(x+1)=15$$

=> $$3x=15$$

=> $$x=\frac{15}{3}=5$$

$$\therefore$$ Square of the middle number = $$x^2=5^2=25$$

=> Ans - (B)


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