in 100 grams of food there are 300 clalories in 1 grams of food there are 300/100 clalories in 30 grams of food there are 300 X30/100 clalories=90 calories

If Rahim was 32 years old 8 years ago, how old was he x years ago?

ক) X – 40 খ) x – 24 গ) 40 – x ঘ) 24 – x

ব্যাখ্যা (Explanation)

If he was 32 eight years ago, then now he is 32+8=40. So x years ago he was 40-x.

Two cyclists start biking from a trail start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first cyclist who is traveling at 6 miles per hour. How much time will pass beforenthe second cyclist catches up with the first from the time the second cyclist started biking?

ক) 2 hours খ) 4(1/2) hours গ) 3(3/4) hours ঘ) 6 hours

ব্যাখ্যা (Explanation)

The first cyclist has a 3 hour head start--and in those three hours, has traveled 3 X 6 = 18 miles. The question now is: how long will it take for the second cyclist to travel 18 miles more than the first cyclist. The second cyclist will gain 10 - 6 = 4 miles / hour so 18 / 4 = 4.5 hours the second cyclist will catch up in 4.5 hours after starting. with equation goodness: distance = speed X time (where t is time after the second cyclist starts) 18 = 10t - 6t = 4t 18/4 = t = 4.5

If two planes leave the same airport at 1:00 PM, how many miles apart will they be a 00 PM if one travels directly north at 150 mph and the other travels directly west at 200 mph?

ক) 50 miles খ) 100 miles গ) 500 miles ঘ) 700 miles

ব্যাখ্যা (Explanation)

since one plane travel north, the other west, they are at right angles

North = 150X2 =300

West = 200X2=400

By Pythagoras' Theorem, 300 square + 400 square = x square( where x is the distance) x = 500m

Sarah needs to make a cake and some cookies, The cake requires 3/8 cup of sugar and the cookies require 3/5 cup of sugar. Sarah has 15/16 cups of sugar. Does she have enough sugar or how much more does she need?

ক) Has enough sugar খ) needs 1/8 of a cup of sugar গ) needs 3/80 cup of sugar ঘ) needs 6/19 cup of sugar

ব্যাখ্যা (Explanation)

here, she needs= 15/16 - (3/8 + 3/5) = 15/16 - (15 + 24)/40 = 15/16 - 39/40 = (75 - 78)/80 = - 3/80 = 15/16 - (3/8 + 3/5)

= 15/16 - (15 + 24)/40

= 15/16 - 39/40

= (75 - 78)/80

= - 3/80

প্রথম ৩০টি প্রশ্নের ব্যাখ্যা ওয়েবসাইটে; সবগুলোর সম্পূর্ণ ব্যাখ্যা পেতে অ্যাপ ইন্সটল করুন।

অ্যাপ ইন্সটল করুন

Employees of a discount appliance store receive an additional 20% off the lowest price on an item. If an employee purchases a dishwasher during a 15% off sale, how much will he pay if the dishwasher originally cost $450?

ক) $280.90 খ) $287 গ) $292.50 ঘ) $306

ব্যাখ্যা (Explanation)

original price = $450 The sale price will be = the original price less 15 % discount 15% off so the sale price = 450-0.15*450 sale price = $ 382.50 Employee gets 20% off on this price The employee has to pay= 382.50 - (0.20X382.50)= $306

To produce an old photograph, a photographer charges x dollars to make a negative 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph how many dollars the photographer charges to make a negative?

ক) 3 খ) 3.5 গ) 4 ঘ) 4.5

ব্যাখ্যা (Explanation)

equation is x+(3x/5)(10)+(x/5)(10)=45 x+(3x/5)(10)+(x/5)(10)=45 x+6x+2x=45 9x=45 x=5

If k is divisible by 2, 3, and 15, which of the following is also divisible by these numbers?

ক) K+5 খ) k+15 গ) k+20 ঘ) k+30

ব্যাখ্যা (Explanation)

Basically any multiple of these number so if you factorize 15 its = 3 x 5 therefore 2x3x5 = 30 So, K + 30 will always be divisible by the given numbers.

A two digit number has 3 in its unit digit. The sum of its digits is one-seventh of the number itself. What is the number?

ক) 73 খ) 63 গ) 53 ঘ) 50

ব্যাখ্যা (Explanation)

Let n = tens digit Let m = units digit Then your whole number is N = 10 X n + m……(1) here, n + m = 1/7 X (10Xn + m)……….(2)

the units digit is 3 or

m = 3

Now to solve, put 3 into (2) and get

n + 3 = 1/7 X (10 X n + 3) or, 7 X n + 21 = 10 X n + 3 where simply multiplied both sides by 7.

Or,3Xn = 18 or, n = 6

Therefore your number is from (1)

N = 10X6 + 3 or N = 63

A special lottery is to be held to select the student who will live in the only deluxe room in a dormitory, There are 100 seniors, 150 juniors, and 200 sophomores who applied. Each senior’s name is placed in the lottery 3 times; each junior’s name, 2 times; and each sophomore’s 1 time. What is the probability that a senior’s name will be chosen?

ক) 1/8 খ) 2/9 গ) 2/7 ঘ) 3/8

ব্যাখ্যা (Explanation)

There are 100*3=300 senior

There are 150*2=300 junior

There are 200*1=200 sophomore total student=(300+300+200)=800

Prob of selecting a senior = 300/800=3/8

If 6 workers can complete 9 identicaljobs in 3 days, how long (in days) will it take 4 workers to complete10 such jobs?

ক) 5 খ) 4 গ) 6 ঘ) 3

ব্যাখ্যা (Explanation)

6 workers can complete 9 identical jobs in 3 days. 1 worker can complete 9 identical jobs in 18 days 4 workers can complete 36 identical jobs in 18 days 4 workers can complete 10 jobs in 5 days.

In Islamic Banking the customers are considers as ____ and thus entitled profit sharing.