Question

It takes Jacki 3 hours to complete 7 posters and 9 hours to complete 21 posters.How long will it take her to complete 28 posters

Answer 1

12

Step-by-step explanation
Based on the given conditions, formulate: 28 \times 3 \div 7
Calculate the product or quotient:\dfrac{84}{7}
Cross out the common factor:12
get the result:12
Answer: 12
Based on the given conditions, formulate:
28
×

3
÷

7

Calculate the product or quotient:
84
7

Cross out the common factor:
12

get the result:
12

Answer: