Photo egative

Negative dimensions are 36mm and 28mm. What will be the photo size in the 21:4 ratio?

Correct answer:

a =  18.9 cm
b =  14.7 cm

Step-by-step explanation:

$$\begin{gathered} k=21\mathrm{/}4\mathrm{/}10={\displaystyle \frac{21}{40}}=0.525 \\ a=36\cdot k=36\cdot 0.525={\displaystyle \frac{189}{10}}\text{ cm}=18.9\text{ cm} \end{gathered}$$

$b=28\cdot k=28\cdot 0.525={\displaystyle \frac{147}{10}}\text{ cm}=14.7\text{ cm}$

Try another example

Related math problems and questions:

• Plan of the village
  Plan of the municipality in 1:1000 scale has plotted garden with dimensions 25 mm and 28 mm. Determine the area of gardens in ares in reality.
• Scale of plan
  On the plan of the village in the scale of 1: 1000 a rectangular garden is drawn. Its dimensions on the plan are 25mm and 28mm. Determine the area of the garden in ares.
• Change the numbers in the ratio
  Change the numbers 29, 38, and 43 in a 3: 4 ratio.
• Garden
  The rectangular garden has dimensions of 27 m and 30 m. Peter and Katka split it in a ratio of 4:5. How many square meters did Katkin measure part of the garden?
• Jan
  Jan is 13 years and Peter 21 years old. For how many years will their ages in the ratio of 7:9?
• Two brothers
  The two brothers were to be divided according to the will of land at an area of 1ha 86a 30m² in a ratio of 5:4. How many will everyone get?
• Small city
  The length of the street is 230 m. What will be the length of its image on the plan at a scale of 1: 2500?
• Rainfall
  A rectangular garden of 25m in length and width 20m in width fall 4mm of water. Express by a fraction in basic form what part of the 60-hectolitre tank we would fill with this water.
• Map scale
  What is the scale of the map, if 5.4 km is 72 mm on the map?
• Photo enlarge
  Mark wants to enlarge a 4-inch by 6-inch photo so that it has a height of 15inches. Use a ratio table to determine the new width of the photo.
• How much
  How much money will we pay for 20 planks 4m long, 15cm wide and 26mm thick when 1m³ of wood costs 4500kč?
• Reducing scale
  I am sizing some landscaping and I measured everything for a 20 to 1 scale. I realized when I was done that it was at 30 to 1. How can I convert what I already have to 30 to 1. (Example, grass area is 22,871.6' at 20 to 1, how do you figure it out to be 3
• Pamela
  Lara Pamela spends her salary of 3000 for food, clothing, recreation and savings, which are in the ratio of 48:20:15:37, respectively. How much does he spend for savings?
• Negative and postcard
  The image on the negative has dimensions of 36x24 mm and is enlarged to a postcard format of 13.5x9 cm. In what proportion have the lengths increased? In what proportion has the image content increased?
• Ratio three numbers
  Three numbers SUV are in the ratio 1:2:3. Their sum is 24. Find this numbers and write their add and sum.
• The sidewalk
  The sidewalk is 50 m long. What will be its length on the plot plan in the scale of 1: 200?
• Find the 24
  Find the difference between 2/7 and 1/21