Grade 11 physics~please help me to solve it~thanks

题目

Grade 11 physics~please help me to solve it~thanks
1.The Earth's diameter is about 1 x 10^7,The sun's diameter is about 1 x 10^9.The radius of the Earth's orbit about the sun is about 1 x 10^11.Calculate each.
a.The approximate number of Earth diameters in the diameter of the sun
b.The approximate number of Earth diameters in the radius of the Earth's orbit

答案

a:divide the the sun's diameter by the earth's diameter
b:divide the earth's orbit by the earth's diameter
Be careful about the unit of these diameters