book Maths Puzzle Numerical Ability

Can someone help me with this problem?

Subtract 45.6
- 8.85

Thanks!

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book Other Question

"A purse contains 22 coins, some of wich are dimes and the rest, quarters, Altogether, the coins are worth more than $3.40. At least how many of the coins are quarters? At most how many are dimes?
Please help me!" perform the indicated operations (12x^2-xy-y^2)+(x^2+6xy+12y^2)