exam Maths Puzzle Numerical Ability

Would someone check this for me, Thanks so much.

7/9 -(-13/18) I have 3/2 as an answer.

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exam Other Question

needing some help in this problem
A group of 7 boys and 5 girls
a- How many diffrent committees each consisting of 3 boys and 2 girls can be formed ?
b- If Tom is the head of the committee how many different committees can be formed?
Please help?
Solve.

5/x+4 + 3 = 2/x+4