Test your Maths

Test your Maths:

1. Five positive integers ( not necessary all different) are written on five cards. Boris calculates the sum of the numbers on every pair of cards. He obtains only three different totals: 57, 70 and 83. What is the largest integer on any card?

A 35 B 42 C 48 D 53 E 82

Answer:( C-48, 48+35=83, 48+ 22=70, 48+ 9=57)

2. I have three mathematical dogs called Pooh, Bin and Rex. Pooh and Bin together weigh 7 kg, Bin and Rex together weigh 8 kg, Rex and pooh together weigh 11 kg.

What would my dogs weigh if I weighed all three together?

Answer:( 13 kg, P+B+B+R+R+P= (7+8+11):2= 13

3. When 15 is divided by the positive integer k, the reminder is 3. For how many different values of k is this true?

(A) One (B) Two (C) Three (D) Four (E) Five

Answer: 4,6,12- Three (C)

4. Masha, Olga, Alex and Daria have their 12 th, 14 th, 15 th and 15 th birthdays in the same day of 2013. In what year will their ages will total 100?

(A) 2023 (B) 2024 (C) 2025 (D) 2057 (E) 2113

Answer: (12+x)+(14+x)+(15+x)+(15+x)=100

12+14+15+15+4*x=100

X+11 Answer: 2024

OR: (100-56):4= 11+2013= 2024

5. Mike is given pocket money every week by his mother. He saves one-half of it, spends one-quarter of it on a magazine, and one-third of the reminder on sweets. He is left with 80 p. in his wallet. How much pocket money is he given each week?

Answer: 4.80

6. Elena cleans her house every 7 days and does laundry every 5 days. In the next 315 days, how many times will she have to clean her house and do laundry on the same day?

Answer: 9 ( 315: 35)=9 ( уборка и стирка совпадают каждый 35 день)

7. In a game you call out all the numbers from 1 to 100. You clap every time you say either a multiple of 3 or a number ending in 3. How many times would you clap?

Answer: 39

Адрес публикации: https://www.prodlenka.org/metodicheskie-razrabotki/398341-test-your-maths