1. The problem is to verify if the given solutions for each variable in the equations are correct. 2. To check correctness, substitute each found value back into its original equation and see if both sides are equal. 3. Check $m=7$ in $m + 13 = 20$: $$7 + 13 = 20$$ $$20 = 20$$ Correct. 4. Check $f=47$ in $20 = f - 27$: $$20 = 47 - 27$$ $$20 = 20$$ Correct. 5. Check $x=34$ in $3x = 102$: $$3 \times 34 = 102$$ $$102 = 102$$ Correct. 6. Check $e=16$ in $64 = 4e$: $$64 = 4 \times 16$$ $$64 = 64$$ Correct. 7. Check $t=23$ in $t + 28 = 51$: $$23 + 28 = 51$$ $$51 = 51$$ Correct. 8. Check $r=40$ in $r - 10 = 30$: $$40 - 10 = 30$$ $$30 = 30$$ Correct. 9. Check $p=50$ in $p - 11 = 39$: $$50 - 11 = 39$$ $$39 = 39$$ Correct. 10. Check $y=36$ in $\frac{y}{3} = 12$: $$\frac{36}{3} = 12$$ $$12 = 12$$ Correct. 11. Check $n=33$ in $61 = 28 + n$: $$61 = 28 + 33$$ $$61 = 61$$ Correct. 12. Check $b=168$ in $21 = \frac{b}{8}$: $$21 = \frac{168}{8}$$ $$21 = 21$$ Correct. 13. Check $k=19$ in $95 = 5k$: $$95 = 5 \times 19$$ $$95 = 95$$ Correct. 14. Since all substitutions satisfy their equations, all answers are correct.