25 pupils

Twenty-five pupils attend the school dance group, which is 5 percent of all pupils. The judo class is attended by 20 pupils, a quarter of whom also go to a dance group. How many schoolchildren do not go to a dance or judo group?

Correct answer:

x =  460

Step-by-step explanation:

q=5%=1005=201=0.05 t=25 j=20 =j/4=20/4=5  t = q n n=t/q=25/0.05=500  x=ntj+=5002520+5=460

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