Answer:
![\huge {\fbox{ \sf{495}}}](https://img.qammunity.org/2021/formulas/mathematics/college/b94340tczdgwuyl3mgpwo9u8wy7xt761ac.png)
Explanation:
Total numbers of students = 1650
Total percentage of boys = 70%
First , finding the total number of boys :
![\hookrightarrow{ \sf{70 \: \% \: of \: 1650}}](https://img.qammunity.org/2021/formulas/mathematics/college/63lnlivu2v52ge55ln3imha9q12vik1gv9.png)
![\hookrightarrow{ \sf{ (70)/(100) * 1650 }}](https://img.qammunity.org/2021/formulas/mathematics/college/wopqwjemokaiwr8wul46gu73k82ktovh5b.png)
![\hookrightarrow{ \sf{1155}}](https://img.qammunity.org/2021/formulas/mathematics/college/j5bw0a3q22z5b7yuc7r0zfnygrccxa102t.png)
The total number of boys in a school = 1155
Now, finding the total number of girls :
![\sf{ \mapsto{ Total \: number \: of \: student \: - \: Total \: number \: of \: boys}}](https://img.qammunity.org/2021/formulas/mathematics/college/hglmfy0pz94wqvj110ajn5btfd1hyf146p.png)
![\mapsto{ \sf{1650 - 1155}}](https://img.qammunity.org/2021/formulas/mathematics/college/571d3ncfur6dt0dizl8fp2r6e81xecc3ee.png)
![\mapsto{ \sf{495}}](https://img.qammunity.org/2021/formulas/mathematics/college/8vzrjl9ttbbiconozd90wgjvv23ymvmhky.png)
There are 495 girls in the school.
Hope I helped!
Best wishes ! :D
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![\sf{TheAnimeGirl}](https://img.qammunity.org/2021/formulas/mathematics/high-school/vkn3k0ogek01raezz077ivcwczdehjwrq2.png)