exam Maths Puzzle Numerical Ability

Please someone help me with this question. I have a serious brain cramp

5y + 4b_______
axy^2 bx^2y

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exam Other Question

THE GRAPH SHOWS THE NUMBER OF PEOPLE IN COUNTRY A WITHOUT HEALTH INSURANCE FROM 2000 THROUGH 2003.
2000-25 MILLION
2001-29.3MILLION
2002-33.6 MILLION
2003-37.9 MILLION
In 2000 Please help me.
A certain amount of 8% solution must be added to another amount of a 5% salt solution to produce a total of 36 ounces of a 6% solution. How many ounces of each solution is needed?