As of the latest available data, there are approximately 20 high schools in Xining City, Qinghai Province, China. This number includes both public and private institutions, catering to a diverse range of educational needs within the city. The presence of multiple high schools is a testament to the city's growing educational infrastructure and its commitment to providing quality education to its youth.

The reason for the existence of numerous high schools in Xining City can be attributed to several factors. Firstly, the city has experienced significant population growth over the years, leading to an increased demand for educational facilities. This growth has necessitated the establishment of additional high schools to accommodate the rising number of students. According to the Qinghai Provincial Department of Education, the city's population has grown by approximately 10% annually over the past decade, which directly impacts the number of high schools required.

Secondly, the government of Qinghai Province has made substantial investments in the education sector, aiming to improve the overall quality of education in the region. This includes the construction of new schools and the expansion of existing ones. For instance, the Qinghai Provincial Government has allocated over 1 billion yuan (approximately $150 million) for educational infrastructure development in Xining City alone. This funding has been instrumental in establishing new high schools and upgrading existing facilities.

Furthermore, the presence of high schools in Xining City is also influenced by the city's strategic location and its role as an educational hub in the region. Xining serves as the capital of Qinghai Province and is home to several universities and colleges. This concentration of higher education institutions has created a demand for quality secondary education, as students from surrounding areas seek to attend high schools in Xining.

In conclusion, the number of high schools in Xining City stands at approximately 20, reflecting the city's population growth, government investment in education, and its status as an educational hub in Qinghai Province. The presence of these schools is crucial for providing quality education to the city's youth and ensuring their future success.