exam Maths Puzzle Numerical Ability

Please help me solve this problem:
9/10=k+7/10

Thanks,
Amy

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exam Other Question

simplify each expression
1. 15(x^4y^3)^4 divided by 21(x^5y)^2
2. 8^0
3. 12 divided by (2x)^0
4. 1 divided by 5^-3 (a^3/b^2)^4=