Percentage - Study Mode
[#41] The number that is to be added to 10% of 320 to have the sum as 30% of 230 is :
Correct Answer
(A) 37
Explanation
Solution: Let the number be x According to the question, x + 320 × $$frac{10}{100}$$ = 230 × $$frac{30}{100}$$ x + 32 = 69 x = 37 Hence, required number = 37
[#42] 25% of 120 + 40% of 380 = ? of 637
Correct Answer
(A) $$frac{2}{7}$$
Explanation
Solution: 120 × $$frac{25}{100}$$ + 380 × $$frac{40}{100}$$ = x × 637 ⇒ 30 + 152 = x × 637 ⇒ $$frac{182}{637}$$ = x ⇒ x = $$frac{2}{7}$$ ⇒ Required answer = $$frac{2}{7}$$
[#43] A number, on subtracting 15 from it reduces to its 80%. What is 40% of the number ?
Correct Answer
(C) 30
Explanation
Solution: Let the number = x According to the question, x - 15 = $$frac{80x}{100}$$ x - 15 = $$frac{4x}{5}$$ 5x - 75 = 4x x = 75 Required answer = 75 × $$frac{40}{100}$$ = 30
[#44] If 35% of A's income is equal to 25% of B's income, then the ratio of A's income to B's income is :
Correct Answer
(B) 5 : 7
Explanation
Solution: A 35% = B 25% $$frac{A}{B}$$ = $$frac{5}{7}$$ A : B = 5 : 7
[#45] If y% of one hour is, 1 minute 12 seconds, then y is equal to :
Correct Answer
(A) 2
Explanation
Solution: 1 hour = 60 minutes 1 min + 12 sec = 1 + $$frac{12}{60}$$ = $$frac{6}{5}$$ min According to the question, 60 × $$frac{y}{100}$$ = $$frac{6}{5}$$ y = 2