( 1).24÷50=0.48=48%

A: The number of girls accounts for 48% of the class.

(2).26÷50=0.52=52%

The number of boys accounts for 52% of the class.

(3).24÷26≈0.923=92.3%

A: The number of girls is 92.3% of the number of boys.

2.

8÷ 1 1≈0.727=72.7%

A: The speed of artificial earth satellite is 72.7% of that of spacecraft.

3.

A: 46/50 = 0.92 = 92%.

B: 27 ÷ 30 = 0.9 = 90%

90%