The sub-duplicate ratio of $64:81$ is .

Important Questions on Ratio, Proportion and Variation

MEDIUM

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 9

If $40$ men complete a piece of work in $5$ days, then $80$ men can complete the same piece of work in _____ days.

MEDIUM

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 10

The mean proportional of $4$ and $9$ is $6$.

MEDIUM

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 11

The numbers $3, 6, 8, 12$ are in proportion. 

MEDIUM

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 12

Eight men can do a certain amount of work in $3$ days. Sixteen men can do the same amount of work in $6$ days. 

HARD

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 13

Of the two ratios $3:5$ and $4:7$ which is greater?

MEDIUM

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 14

Find $x$ if $2, 7, 5, \left(\frac{x}{2}\right)$ are in proportion.

EASY

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 15

Find the mean proportional of $16$ and $4$.

EASY

8th Foundation

IMPORTANT

Pearson IIT Foundation Mathematics Class 8>Chapter 4 - Ratio, Proportion and Variation>PRACTICE QUESTIONS CLASSROOM WING>Q 16

If $7:15=56:x$, then what is the value of $x$?