At a rap concert, the ratio of the number of boys to the number of girls is 9: 5. If there are 320 more boys than girls, how many boys and how many girls are at the concert?

X=80

Step-by-step explanation:

9x=320+5x

9x-5x=320

4x=320

X=320/4

X=80

So the number of girls =5×80

=400.

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5