56. A reduction of 20% in the price of an apple enables a man
to buy 10 apples more for 54. The reduced price of apple
per dozen is
(a) 4.32
(b) * 12.96
(c) 10.80
(d) 14.40
Q5)-A man can row 8 Kmph in still water. If the velocity of the current is 2 Kmph and it takes him 2 hours to row to a place and come back. How far is the place?
Answers
1) Due to reduction, he will save
54×10100= Rs. 5.4
New price/apple =5.410 = Rs. 0.54
New price/dozen = 12×.54
Rs. 6.48 dozen
2) A man can row 8 kms in still water. If in a river flowing at 2 km an hour, it takes him 24 minutes to row to a place and come back, how far of is this place? A) 1.5 km b) 2 km c) 3 km d) 5 km
A man can row 8 km (in an hour, I presume) in still water. If in a river flowing at 2 km an hour, it takes him 24 minutes to row to a place and come back, how is this place?
24 min = 0.4 hr, we’ll use that for convenience.
When going with the current the boat moves at (8+2) or 10 km/hr. When going against the current the boat moves at (8-2) or 6 km/hr.
Let the distance covered each way be x km. So the total time (hr) taken is
(x/10) +(x/6) = 0.4, or
6x + 10x = 0.4*10*6 = 24, or
16x = 24, or
x = 1.5 km. Answer at (A) is right.
Answer:
answer 1 ☝️
answer 2 ☝️
hope it helps you
