The Magic of Mathematics-Maths'n More Team (Ratio-Proportio)

The value of x that makes equality
 $\frac{5}{x}=\frac{2}{4}$  
in true proportion is?

• 15

• 10

• 20

• 8

The value of x at the ratio 

 $\frac{8}{4}=\frac{x}{2}$  

• 2

• 3

• 4

• 5

What is the value of x that makes the following equality true. 

 $\frac{80}{10}=\frac{x}{20}$  

• 160

• 40

• 360

• 100

Distance between Lisbon, Portugal and Ankara, Turkey by road is approximately 4532 km. What is the distance between the two capitals on a 1 cm / 200 km scale map?

• 25,55 cm

• 22,66 cm

• 30,2 cm

• 20 cm

At the same time that a 4.5 m high building casts a 13.5 m shadow, how long is the shadow cast by a 130 m high tower?

• 290

• 390

• 490

• 590

Zuzana has to do a project with Nunox, but he lives 5921 meters from Zuzana, in a map with a scale of 2cm /260m. What is the distance on the map that Nunox is going to make, in centimeters?

• 45,5

• 55,5

• 35,5

• 50

A couple wants to buy a ring for their wedding, so they went for a store that sells rings, the store is 57km from their home. In a 1cm/ 500m scale map, what is the distance they will have to make to reach the store?

• 113

• 114

• 155

• 115

The sum of the father and son's age is 45 years. The father's age is for the child's age, just like 7 is for 2.

• father's age is 35 years, son's age is 10 years

• father's age is 10 years, son's age is 35 years

• father's age is 20 years, son's age is 15 years

• father's age is 45 years, son's age is 5 years

 $a+b=55$ 

What is the value of a and b in proportion

 $\frac{a}{b}=\frac{4}{7}$  

•  a= 15, b= 40

• a= 10, b=45

• a=35, b=20

• a = 20, b = 35

In how many days does 8 tractors plow the field in which 4 tractors plow in 20 days?

• 10

• 15

• 20

• 40