Question 407401
# 1


{{{1/35=c/70}}} Start with the given proportion



{{{(1/35)*70=c}}} Multiply both sides by 70



{{{70/35=c}}} Multiply



{{{2=c}}} Simplify



So our answer is  {{{c=2}}} 


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# 2


{{{90/a=15/13}}} Start with the given ratio



{{{90=(15/13)*a}}} Multiply both sides by a



{{{90*13=15*a}}} Multiply both sides by 13



{{{1170=15*a}}} Multiply



{{{1170/15=a}}} Divide both sides by 15



{{{78=a}}} Simplify



So our answer is  {{{a=78}}} 



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