Answer:
Let the three consecutive integers be \[x,\text{ }x+1\] and \[x+2\]. \[\because \] They add up to 51 \[\therefore \] \[x+(x+1)\,+(x+2)\,=51\] \[\Rightarrow \] \[3x+3=51\] \[\Rightarrow \] \[3x=51-3\] | Transposing 3 to RHS \[\Rightarrow \] \[3x=48\] \[\Rightarrow \] \[x=\frac{48}{3}\,=16\] | Dividing both sides by 3 \[\Rightarrow \] \[x+1=16+1=17\] and \[x+2=16+2=18\]. Hence, the desired integers are 16, 17 and 18. Check: \[17=16+1\] \[18=17+1\] | as desired \[16+17+18=51\].
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