The cost of 3 pens will be 27P and the cost of 2 rulers will be 30p.
The mathematical expression is the combination of numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.
Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also be used to denote the logical syntax's operation order and other properties.
Given that the cost of 5 pens and 3 rulers is 90p the cost of 2 pens and 1 ruler is 33p. the cost of 3 pens and 2 rulers will be calculated as below:-
From the equations and solve:-
5p + 3r = 90p
2p + r = 33p
5p + 3r = 90p
-6p - 3r = -99p
Cost of one pen P = 9
The cost of the 1 ruler:-
2p + r = 33p
2 x 9 + r = 33
18 + r = 33
r = 33 - 18
r = 15
Cost of 3 pens = 3 x 9 = 27
Cost of 2 rulers = 2 x 15 = 30
Therefore, the cost of 3 pens will be 27P and the cost of 2 rulers will be 30p.
To know more about an expression follow
https://brainly.com/question/26665749
#SPJ1