Mass of electron:9.109 times 10^-31 kg
mass of proton: 1.673 times 10-27
speed of light=3.0 times 10^8
avogadro's number 6.02 times 10^32
planck's constant: 6.63 times 10^-34
just google chem constants sheet
Let the no. Of horses be x
9÷2 = 72÷x
X= 144÷9
No. Of horses = 16
For a 2:7 ratio there would be 100 boys and 350 girls
