At a school The ratio of the number of boys to number of girls = 9:7
There are 100 more boys than girls.
Work out the total number of students at the school.

1600

Step-by-step explanation:

b : g : total

9 : 7 : 16

difference-> 9-7=2

2u->100

1u-> 50

16u-> 1600

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have