Final answer:
To divide 1 whole 3/4 by a certain number to get 2 whole 1/2, we need the fraction 1 whole 3/4 to be converted into 7/4 and then divided by 5/2, which equals 14/20.
Step-by-step explanation:
To find the number by which 1 whole 3/4 should be divided to get 2 whole 1/2, we need to convert the mixed numbers to improper fractions and then divide.
1 whole 3/4 as an improper fraction is 7/4.
Now, we can divide 7/4 by 5/2 to get the answer.
When we divide fractions, we multiply by the reciprocal of the divisor. So, 7/4 divided by 5/2 is equal to 7/4 multiplied by 2/5, which simplifies to 14/20.
Therefore, 1 whole 3/4 should be divided by 14/20 to get 2 whole 1/2.
Learn more about Fraction Division