Wgh2005:

Hi, hope someone can help solve this question, thank you!


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Daddy

The school library has four times as many English books as Chinese books. After 392 new Chinese books were added, there were twice as many Chinese books as English books. How many Chinese books were there at first?


Model answer: 784 (or error?)
TIA!

My answer is 56.

hoddle:

Hi


Please help to solve the following.

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Kangkangteo:

NerdyMath:

Daniel and his friends wanted to paint the rooms of a new house. If they paint 6 rooms per day, they will be able to complete painting all of the rooms ahead of time by 1 day. If they paint 4 rooms per day, they will be behind schedule by 2 days. How many rooms are there?

6 x (T - 1) = 4 x (T + 2)

6 T - 4 T = 8 + 6

2 T = 14

T = 14/2
= 7 days

6 x 6 = 36 rooms (or 4 x 9 = 36)

There are 36 rooms.

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alfretztay:

COOKIE64:

Please help



Mrs Goh had some $2 notes and some $10 notes. She had 95 notes altogether。 when she exchanged all the $10 notes for $2 notes she found that she had 175 notes . How many $2 notes did she have at first..

175 – 95 = 80
80/(5 – 1) = 20
95 – 20 = 75

Alternatively,
Let x and y be the number of $2- and $10- notes respectively.
x + y ——- 95
x + 5y ——- 175
4y ——- 175 – 95 = 80
1y ——- 80/4 = 20
95 – 20 = 75

Ans : 75 $2-notes.

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leo_mums:

Mark and Jie Ming started walking from the same spot in the opposite directions along a straight path. They walked for 30 minutes. At the end of the walk, they were 5 km apart. Mark's average speed was 4 km/h. What was Jie Ming's average speed?

In 30 minutes,
Mark walked for 4x0.5 = 2 km.
Jie Ming walked for 5-2 = 3 km.

Hence, Jie Ming's speed was 3/0.5 = 6 km/h.

leo_mums:

Tom and Jerry take 1 hour to clean the fish tank together. If Tom take 3 hours to clean the tank on his own, how long will it Jerry to clean the tank alone?

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EC72:

Ivan cycled from the school to the library at 80m/min. His sister cycled from the library to the school at 65m/min. Both of them started cycling towards each other at the same time and did not change their speeds throughout their journey. When Ivan reached the library, his sister was 480 m from the school. What was the distance between the school and the library?

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fuzzy@:

Randy and Owen left town W for town X at the same time. When Randy reached Town X in 4 hours, Owen had only completed 3/8 of the distance between the two towns. Owen's speed was 30 km/h slower than Randy. What was Randy's speed?

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EC72:

Sally bought some chocolates and gave half of them to Mable. Sally also bought some lollipops and gave half of them to Mabel. Mable ate 7 lollipops and Sally ate 16 chocolates.

After that, the number of lollipops and chocolates Mable had were in the ratio 1:8 and the number of lollipops and chocolates Sally had were in the ratio 1:5. How many lollipops did Sally buy at first?

Can someone help me with this question. Thanks in advance.

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