state gov JKSSB Junior Assistant Mock Test Quantitative Aptitude Ratio and Proportion Simple Ratios

The ratio of boys and girls in a school is 7 : 9. If 40 boys join the school and 40 girls leave the school, the ratio becomes 9 : 7. The number of boys initially in the school is?    

1
180
2
140
3
220
4
160
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