21 chaperones are needed for 420 students.
Step-by-step explanation:
No. of juniors = 148
No. of seniors = 272
Total = 148+272 = 420 students
3 chaperones = 60 students
1 chaperone =
Ratio of chaperon to students = 1:20
Let,
x be the number of chaperons for 420 students.
Ration of chaperones to students = x:420
Using proportion
Ratio of chaperones to students :: Ratio of chaperons to students
Product of mean = Product of extreme
Dividing both sides by 20
21 chaperones are needed for 420 students.
Keywords: ratio, proportion
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Partial products are the products obtained during the intermediate stages in order to complete a multiplication process.
Consider 68 43, we have to determine the partial products in this.
Now,
Expanding this, we get
=
= 2400 + 180 + 320 + 24
= 2924
Hence, and
are the required partial products in the product of 68 and 43.
So, Option 3 and 4 are the correct answers.