Question

A student solved this problem and said the answer is 5\8 pounds.

Answer 1

Answer:

B. No, the answer is not reasonable. It should be a bit more than 1 1/2 pounds.

Step-by-step explanation:

We have been given that Gino has $3\frac{7}{8}$ pounds of grapes. He has $2\frac{1}{4}$ pounds of green grapes and the rest are red grapes. A student solved this problem and said the answer is $\frac{5}{8}$ pounds.

Let us solve the given problem by subtracting $2\frac{1}{4}$ from $3\frac{7}{8}$.

$3\frac{7}{8}-2\frac{1}{4}$

$\frac{3*8+7}{8}-\frac{2*4+1}{4}$

$\frac{31}{8}-\frac{9}{4}$

$\frac{31}{8}-\frac{9*2}{4*2}$

$\frac{31}{8}-\frac{18}{8}$

$\frac{31-18}{8}$

$\frac{13}{8}$

$1\frac{5}{8}$

Since $1\frac{5}{8}$ is greater than $1\frac{1}{2}$, therefore, option B is the correct choice.

Answer 2

1 3/8 lbs. 2 1/2 = 2 4/8. (8/8 is 1 lb) 2 4/8 + 8/8 = 3 4/8 add 3/8 to equal 3 7/8. You have added 1 3/8 lb to 2 1/2 lb to make 3 7/8 lbs.