A typist takes 40 minutes to type 4 pages. How many pages will he type in 90 minutes?
9
Find the typing rate in pages per minute.
Rate \(= \dfrac{4 \text{ pages}}{40 \text{ minutes}} = \dfrac{1}{10}\) page per minute.
Pages typed in 90 minutes \(= \dfrac{1}{10} \times 90 = 9\).
Hence, the typist will type 9 pages in 90 minutes.
Important Questions from Direct or Indirect Proportion
If 3A = 4B = 5C, then A : B : C is equal to:
The monthly incomes of A and B are in the ration 3 : 5 and the ratio of their savings is 2 : 3 If the income of B is equal to three times the savings of A, then what is the ratio of the expenditures of A and B?
If an amount of Rs. 990 is divided among A, B and C in the ratio of 3 : 4 : 2, then B will get:
The ratio of boys and girls in a group is 7 : 6. If 4 more boys join the group and 3 girls leave the group, then the ratio of boys to girls becomes 4 : 3. What is the total number of boys and girls initially in the group?
The ratio of the number of boys to the number of girls in a school of 640 students, is 5 : 3. If 30 more girls are admitted in the school, then how many more boys should be admitted so that the ratio of boys to that of the girls, becomes 14 : 9.
