book Maths Puzzle Numerical Ability

OK I DONT GET HOW TO DO IT...
2/3 * 1/3??...

Read Solution (Total 0)

book Other Question

solve

Seventy two students are separated into two groups.the first group is 5 times as large as the second. How many students are in each group? a^2-ab+10a-10b
______________
a+10