51.

A can do a piece of work in 8 days and B can do it in 10 days separately. How many days would it take for both A and B to finish the same work together?

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The lengths of the diagonal of a rhombus are 8cm and 6 cm. The area of rhombus is:

• 96 cm²

• 60 cm²

• 48 cm²

• 24 cm²

Two successive discounts of 10% and 20% are equivalent to a single discount of

• 28%

• 27%

• 25%

• 30%

A and B together have Rs 6,300/-. If  of A's income is equal to  of B's amount. The amount of B is

• Rs 2,500

• Rs 3,800

• Rs 2,300

• Rs 4,000

If the selling price of 40 articles is equal to the cost price of 50 articles, the loss or gain percent is

• 25% gain

• 20% gain

• 25% loss

• 20% loss

A's income is 25% more than B's income. B's income is what percent of A's income?

• 80%

• 75%

• 50%

• 25%

In what time will a train, 60m long, running at the rate of 36 km/h pass a telegraph post?

• 9 sec

• 8 sec

• 7 sec

• 6 sec

If  then  is equal to

If   then r : h is 

• 17 : 8

• 8 : 17

• 8 : 15

• 15 : 8

If sin A + sin²A = 1  then what is the value of cos²A + cos⁴A?

• 1

• 2

• 1/2

• 1/4