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2 .The length of a rectangle is increased by 40%. By what percent the width of the rectangle have to be decreased to maintain the same area?

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3 .Which is the greatest in $6\sqrt{4}$, $5\sqrt{5}$, $6\sqrt{6}$, $3\sqrt{2}$ is-

A.$6\sqrt{4}$

B.$5\sqrt{5}$

C.$6\sqrt{6}$

D.$3\sqrt 2$

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4 .By selling a watch at a profit of 60% a man got ` 38 more than one third of its cost price. What is the cost price of watch?

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5 .A man whose bowling average is 12.4 takes 6 wickets for 36 runs and there by decrease his average by 0.4. The number of wickets taken by him before his last match is â€“

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6 .The average age of 11 players of a cricket team is decreased by 3 months when two of them aged 17 years and 20 years are replaced by two new players. The average age of the new players isâ€“

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7 .The value of $sin 39Âº\over cos 51Âº$ + 2tan11Âº tan31Âº tan45Âº .tan59Âº .tan79Âº â€“ 3 (sin 2 21Âº + sin 2 69Âº) is â€“

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8 .A polygon has 44 diagonals. The number of sides of the polygon isâ€“

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9 .

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10 .The perimeter of a rhombus is 80 cm and the measure of one of its angle is 60Âº, then its area will beâ€“

A. $100\sqrt3$ $cm^2$

B. $200\sqrt3$ $cm^2$

C. $50\sqrt3$ $cm^2$

D. $150\sqrt3$ $cm^2$

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