Question 23907
You can solve this problem using a ratio.
Variable {{{P[1]}}} will be the 150 pound person, and variable {{{P[2]}}} will be the 100 pound person.
Variable {{{C[1]}}} will be the 100 calories burned, and varible {{{C[2]}}} will be the unknown.
So, set up the ratio.
{{{P[1]/C[1]=P[2]/C[2]}}}
Replace the variables with known numbers.
{{{150/100=100/C[2]}}}
Cross multiply to solve for {{{C[2]}}}
{{{150*C[2]=10000}}}
{{{10000/150=C[2]}}}
{{{C[2]=66.666}}}
Hope this helps!