Speed of boat in still water is 12 km/h and speed of stream is 4 km/h. The boat takes total 6 hours to go and come back, Find the length of river. (a)          23 km (b)          45 km ...

While tabulation of marks scored in an examination by the students of a class, by mistake the marks scored by one student got recorded as 93 in place of 63, and thereby the average marks increased by 0.5. What was the number of students in the class? (a) 20 (b) 60 (c) 30 (d) 15 Sol: ...

LCM and HCF of two four digits number are 21527 and 103 find the sum of these two numbers? (a)          2884 (b)          2464 (c)           3129 ...

If (a+b)=2,(b+c)=1, and (c+a)=3 then find a3+b3+c3 ? (a) 3 (b) 1 (c) 8 (d) 9 Sol: a + b = 2 b + c = 1 c + a = 3 (a + b + c) = 3 Cube both sides a³ + b³ + c³ + 3(a + b) (b + c) (c + a) = 27 a³ + b³ + c³ = 27 – 18 = 9

The expression    is equal to (a)   –   –  (b)   –   +  (c)   –   –  (d) (  +   –             ) Sol: As we know (a + b + ...

Find the value of    if A + B + C = 0  (a)         ½ cosA cosB cosC (b)          ¼ secA secB secC (c)           ½ secA secB secC ...

If two circles of radius 7 cm and 8 cm have two common tangent AB and CD which touch the circle on A, C and B, D respectively and if CD = 26, find the length of AB. (a)          33 (b)          30 ...

The marked price of an article is Rs 1700. If two successive discounts, each of x%, on the marked price is equal to a single discount of Rs 584.63, then what will be the selling price of the article if a single discount of x% is given on the marked price? (a) 1431 (b) 1343 (c) 1377 (d) ...

26% of goods were sold at a profit of 55%, while the remaining ere sold at x% loss. If the overall loss is 11%, then what is the value of x? (correct to one decimal place) (a) 30.3 (b) 34.1 (c) 33.3 (d) 35.1 Sol: 26% = → total goods. ATQ. 13 → 55% = 715 37 → x% = 50 → ...

A boy wrote successive whole numbers starting from 1 up to 800. In doing so, how many times did he write the digit 8? (a) 160 (b) 161 (c) 152 (d) 260 Sol: In line ⊣ 8, 18, 28, ---- 98 = 10 × 8 = 80 In line ⊣ 80, 81, 82, ------89 ⇒ 10 × 8 = 80 And Iine 800 = 1 ⇒ 80 + 80 + ...

A metallic wire of uniform cross-section is melted to form 28 small solid spheres of radius 12.6 cm each. If the radius of wire is 1/7   time more than the radius of each sphere, what is the length of the wire? (a)          260 cm ...

Let x =444133+831616-463°×3416-24662 then what is the unit digit of x ? (a)          8 (b)          2 (c)           0 ...