In a class of 60 students, the ratio of girls to boys is 7: 5 how many girls are in the class how many boys are in the class?

There are 35 girls and 25 boys in the class.

Explanation

The ratio of girls to boys is 7 : 5

So, lets assume that the number of girls is and the number of boys is

Given that the total number of students in the class is 60. That means...

So, the number of girls,

and the number of boys,

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: