Question
Present age of 'X' is 60% more than that of 'Y'. Present
age of 'Z', who is 5 years older than 'Y', is 25 years. After how many years from now, ratio of ages of 'X' to 'Y' will become 7:5.Solution
ATQ, Present age of 'Y' = 25 – 5 = 20 years
Present age of 'X' = 1.6 × 20 = 32 years
Let the required time be 'T' years.
So, (32 + T) : (20 + T) = 7 : 5
Or, 5 × (32 + T) = 7 × (20 + T)
Or, 160 + 5T = 140 + 7T
Or, 2T = 20
Or, 'T' = 10 years
What value should come in place of (?) in the given expression.
450 ÷ 9 + 75% of 160 − 64 ÷ 4 = ?
2/5 of 3/4 of 7/9 of 14400 = ?
7/3 of 4/5 of 15/56 of ? = 83
[564 + 32 of 18 × 9 ÷ 12 + 162 ] ÷ 4 = ?
What should come in place of (?) question mark in the given expression.
(25% of 320) + (3/8 of 400) − 30 = ?
45% of 360 - 160 + ? = √324
187 ÷ 5 ÷ 0.4 = ? – 24 × 2.4
Find the simplified value of the following expression:
[{12 + (13 × 4 ÷ 2 ÷ 2) × 5 – 8} + 13 of 8]
18 × 15 + 86 – 58 =? + 38
√(24²+285-8²-172) = ?²
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