Answer: 32
Step-by-step explanation:
Given: The energy needed for 1 hour of running for an adult [tex]=4.5\times10^6\ joules.[/tex]
Therefore. the energy needed for seven hours of running=[tex]=7\times4.5\times10^6\ joules.=31.5\times10^6\ joules[/tex]
Since, he energy released by metabolism of 1 average candy bar [tex]=1\times10^6\ joules.[/tex]
Therefore, the number of candy bars an adult need to eat to supply the energy needed for seven hours of running.=[tex]\frac{31.5\times10^6}{1\times10^6}=31.5\approx32[/tex]
Hence, the adult need to eat 32 candies to supply the energy needed for seven hours of running.
