What is the area, in square units, of triangle QRS?.
1 answer:
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Answer:
Therefore, Steve will paint house for 20.6 days.
Step-by-step explanation:
We know that Steve determines that it would take them 9 days to paint the house together (if they were both healthy) and that it would take Janet (when healthy) 16 days to paint the house alone.
We conclude that in 1 day Janet painted 1/16 of the house. In nine days, Janet painted 9/16 of house.
So, 7/16 of house paint Steve in nine days.
We have the following proportion:
Therefore, Steve will paint house for 20.6 days.
First off... let's use the decimal format for the percentages, so 85% is 85/100 or 0.85 and 45% is 45/100 or 0.45 and so on
let's say the quantities of each are "a" and "b" respectively
how much salt concentration in A? well, 0.45, so for a quantity "a", that'd be 0.45a
how much satl concentration in B? well 0.85, so for a quantity "b", that'd be 0.85b
now, she wants a mixture of 160ounces with 70% concentration, or 0.7
so the mixture will have a concentration amount of salt of 160 * 0.7
solve for "a", to see how much of the 45% solution will be needed.
what about "b"? well, b = 160 - a
let's say the quantities of each are "a" and "b" respectively
how much salt concentration in A? well, 0.45, so for a quantity "a", that'd be 0.45a
how much satl concentration in B? well 0.85, so for a quantity "b", that'd be 0.85b
now, she wants a mixture of 160ounces with 70% concentration, or 0.7
so the mixture will have a concentration amount of salt of 160 * 0.7
solve for "a", to see how much of the 45% solution will be needed.
what about "b"? well, b = 160 - a
Step-by-step explanation:
Total number of students =
48+28+17+27 = 120 students
Total degree= 360°
