Question

Two numbers are in the ratio 5:7. If their difference is 2.5, then which of the following is their sum?
a. 7.5
b. 12.5
c. 15
d. 10​

Answer 1

15

Step-by-step explanation:

let he numbers be 5x and 7x respectively.

7x-5x=2.5

2x=2.5

x=2.5/2=1.25

therefore

5x=1.25*5=6.25

7x=1.25*7=8.75

so

7x+5x

8.75+6.25

15

Answer 2

Answer:

Your ans is c.15

first concept

x:y=5:7

second consept

y-x=2.5

y=x+2.5

put value of y into 1st concept

x : x+2.5= 5:7

solve it by cross multiplication

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