The correct option is
B 1,176 roses
Number of red roses = 12
Number of yellow roses = 9
∴ Number of roses in 1 bouquet
= 12 + 9 = 21
So, total number of roses in 56 bouquets = 21 × 56
Let us solve this using lattice algorithm method.
So, we first make a table of 2 columns and 2 rows because both 21 and 56 are 2-digit numbers.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1196063/original_612247_1.png)
After making the table, we extend the diagonals and write 2 and 1 at the top of each column and 5 and 6 against each row.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1196065/original_613049_2.png)
Now, we multiply the digits in the corresponding rows and columns and write them on each side of the diagonal line.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1196066/original_613049_3.png)
At last, we add digits diagonally. If the summation is more than 1-digit, we regroup other digits with the next diagonal to the left.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1196067/original_613049_4.png)
For the final answer, we write the digits from left to right, that is, 1,176.
Hence, there are 1,176 roses in total.