Question
Out of 6 numbers, the sum of the first 5 numbers is 7
times the number. If their average is 136, then the 6th number is:Solution
Average of 6 numbers = 136 (average = sum of terms/number of terms) Sum of 6 numbers = 136 × 6 = 816 ---(1) Let the 6th number be x. Sum of 5 numbers = 7x From eq(1), 7x + x = 816 x = 816/8 = 102 The 6th number is 102.
A girl found the answer for the question “subtract the sum 1/2 and 1/8 from unity and express the answer in decimals” as 1.5. The percentage...
Two boys are on opposite sides of a tower of 100 m height. If they measure the elevation of the top of the tower as 30° and 45° respectively the...
Find the H.C.F OF ( 1179 + 1379)and (1385 + 1185 )
The ratio of two number is 6 : 5 and their HCF is 15. So find and their LCM?
The efficiency of A,B,C,D are in the ratio of 6:5:4:3. If A and C can do a work together in 6 days. Then How many days B and D will take to complete the...
If x+ 1/x = 3, then find the value of 2x/(3x²-5x+3)
In a Mixture , the ratio of Milk and Water is 7 : 5. If 12 litre mixture is drawn off and replaced by 8 litre water then the ratio of Milk and Water bec...
The diameter of the base of a cylindrical drum is 21 dm and the height is 12 dm. It is full of petrol. How many tins each of size 15 cm × 11 cm &t...
If 4x + 1/5x = 4, then find value of 125x³ + 1/64x³
When N is divided by 5 the remainder is 2. What is the remainder, when n³ is divided by 5?
Relevant for Exams:
