20 adults and 50 kids.
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Ax+By=C [Use the standard form of a linear equation]
x+y=C so, x+(C-x)=C [also use this formula]
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$5.50x+$4.00y=$310 [plug-in the values]
Since x+(C-y)=C, than x+y=70 or x+(70-x)=70
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5.50x+4.00(70-x)=310 [substitute (70-x) for y and simplify]
5.50x+280-4x=310
5.50-4=310-280 [solve for x]
1.5x=30
x=20 adults
and
y=(70-x)=70-20=50 kids under 12.
Answer:
1.42 pages
Step-by-step explanation:
10/7= 1.42 that'd be the pages per second
The first way is distributive property of multiplication. 3/5*9=3/9÷5/1=27/5. 3/5*1/2=3*1/5*2=3/10. Then you add the products and you would get 57/10. Simplify 57/10 to 5 7/10. Second way, converting the mixed fraction to a improper fraction and then multiply. 9 1/2=9*2+1÷2=19/2. 3/5*19/2=3*19/5*2=57/10. Like I said before, 57/10 simplified is 5 7/10. The last way is use rounding of fractions to estimate the products, 3/5*9 1/2. Round 9 1/2 to 10. 3/5*10=3*10/5. 30/5=6, which means that 6 is the estimated product of rounding. Hoped I helped. :)
Answer highlighted in blue. Hope this helps.
