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how many 5's between 10 to 190

the cost price of a chair is 25% less than the cost price of 8 table if a man sells five chairs at the cost price of 7 table what is the profit percent

uttam spent 75% of his income. if his income increased by 40% and expenditure also increase by 40/3%. find percentage increase in savings

i want to start preparing chapters like time and work profit and loss etc.. i am very weak in this sections of Quant..
do you have any suggestions regarding this matter
thanks

Efficiency of Varun is 125 percent of the efficiency of tarun. Tarun starts the work and completes 32.5% of work alone 13 days, and rest with the help of Varun. In how many days will the whole work be completed?

how to manage all this please need your guidens

5,6,16,37,244,1245,?
7,5,11,49,335,3005,?

how to find divisible number by 12 between 400 to 600

An investor invested 1/2 of his capital at 5%, 1/4 at 10% and rest at 8%. If his income after 2 years is Rs. 2800, find the capital amount.

Time

how find answer through ratio