Education 7919

A total of 10 teachers work at one small school in Moravia. Their monthly salary is CZK 21,500, CZK 21,800, or CZK 22,500, depending on their education and age. The average monthly salary of a teacher at this school is CZK 21,850. How many teachers of this school earn CZK 22,500 per month?

Correct answer:

n =  2

Step-by-step explanation:

(22500n+21500a+21800(10na))/10 = 21850 2250n +2150a+2180(10na) = 21850 225n +215a+218(10na) = 2185  225 = 3 × 3 × 5 × 5 = 32 × 52 215 = 5 × 43 218 = 2 × 109 2185 = 5 × 19 × 23  n>0 a>0 n<10 a<10  a1=3 n1=2  a2=10 n2=5  a3=17 n3=8  n=n1=2



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