NRA CGL (National Recruitment Agency-Combined Graduate Level) Mathematics: Questions 190 - 196 of 425

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A and B are two alloys of gold and copper prepared by mixing metals in the ratios 2: 7 and 7: 11 respectively. Equal quantities of these alloys are melted to form a third alloy C. the ratio of gold and copper in the alloy C is (Paper- I)

Question

The difference of and is (Paper-1)

Question

Three numbers A, B and C are in the ratio . Their average is 800. If A is increased by and B is decreased by , then to get the average increased by , C will be increased by (Paper - I)

Question

26,52,78, ________.

Find the missing number in given series.

Question

The present age of a father is 2 years more than three times the age of his son. two years hence, father’s age will be 10 years more than twice the age of the son. The father’s present age is (Paper- I)

Question

P and Q together can do a piece of work in 10 days, Q and R in 12 days, and P and R in 15 days. The number of days all of them working together take to complete the work is (Paper - I)

Question

A ladder 30 m long is placed in street so as to reach a window 24 m high. On turning the ladder on the other side of the street, it reaches a point 18 m high. The width of the street is (Paper - I)