exam Maths Puzzle Numerical Ability

How do I do a linear equation of

a+d=100
1.00a+1.50=120

can you give me the steps to do so.

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exam Other Question

Multiply and simplify by factoring.

√45 * √40 = ________

Those are supposed to be radicals, I hope I'm using the right symbol.
The newspaper said that only 42% of the registered voters in the school board election. If 11.960 people voted, how many registered voters are there? Write an equation.