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Application of differential multiple problems
1.a has enough money. If A gives it to 30 yuan, all of A's money is 1/5 (score). Do you know how much money Aji has?

30*(5+ 1)/(5- 1)

=30*6/4

=45 yuan

2. The decimal point of the number moves one place to the left, which is 2.25 less than the original number. What is the original number?

2.25/( 1-0. 1)

=2.25/0.9

=2.5

A pen is more expensive than a ballpoint pen, 6.6 yuan. It is known that the unit price of a ballpoint pen is 65438+ 0/4 (fraction) of a pen. What is the unit price of pens and ballpoint pens?

Unit price of ballpoint pen:

6.6/(4- 1)

=6.6/3

=2.2 yuan

Pen unit price

2.2*4

=8.8 yuan