Jo's collection contains US, Indian and British stampsIf the ratio of US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?

A5 : 1
B10 : 5
C15 : 2
D20 : 2
E25 : 2

25 : 2

Step-by-step explanation:

There are US, Indian and British stamps in Jo's collection. He has the US to Indian stamps in ratio 5 : 2 and the Indian to British stamp in ratio 5 : 1.

So, the ratio of US to Indian stamps is 5 : 2 i.e. (5 × 5) : (2 × 5) = 25 : 10

Again, the ratio of Indian to British stamps is 5 : 1 i.e. (5 × 2) : (1 × 2) = 10 : 2

Therefore, the ratio of stamps of the US to Indian to British will be 25 : 10 : 2.

Hence, the ratio of US to British stamps will be 25 : 2 (Answer)

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)