exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

If x = 3 and y = -2, then 7x - 3y over 2x + y =

I believe answer is 27 over 4 but I need to verify my work. Can you show me the breakdown to get correct resolve?

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exam Other Question

A tree diagram shows the possibilites for boys and girls in a two-child family. If a family has 2 children, what are the chances that one child is a girl and one child is a boy?

A 1/4
B 1/3
C 1/2
D 3/4
Dearest tutors.,,, help me with my problem pls!!!
3. One number is 5 greater than another number. If the sum of their squares is 5 times the square of the smaller number, what are the numbers?

Plssss have mercy!!!