Not too sure. Have some difficulty trying to understand "for every 20 questions".

The answer for this question is 40.

There were 40 questions in the test.. Start with what the problem said. For every 20 questions, Roger did not answer 5 and 2 of the questions he answered were marked wrong. Which means that Roger only answered 13 questions correctly. This tells you then that Roger got 13 x 4 = 52 marks. However, he got 2 questions wrong so that means you need to subtract 2 x 5 = 10 marks from 52 marks. Meaning, in 20 questions, Roger got a final mark of 42 marks. However he scored 84 marks. Thus 84 / 42 = 2. It means he answered 2 sets of 20 questions each making the total number of questions 40. Hope this helps.. :)

Thanks Jojo for your help.

I think there is a problem with part (a)... Based on the way I understand it... if the sum of the digits is ODD, then the two digits must have different parity (that is, one is odd and the other must be even.) Both of the digits CANNOT be odd as the sum of two odd numbers is even.

Ya, that's my thought also. Thanks!

Can you show the entire question? It is not clear whether part (a) is related to the stem of the question. Thanks.

This is the entire question.

Is there a part (c)?

No part c

Hmm... ok. I asked because I was thinking that part (a) and (b) may have something to do with the missing question mark. But it doesn't seem to be the case. Looks like you may have to clarify with the teacher about part (a). Maybe there was a typo, or maybe we misread the question (because of its not-so-clear phrasing). I assume that in part (a), the number is a 2-digit number (because of the word "both").

Ok. Thanks so much!

Part b is 13. The missing number next to the 3 is one.

Thanks!

Low Yew Fai, can you take a look at this question? I think there are some mathematical issues with this question. You may be in a better position to comment.

Hmm, seems like the whole question is in a mess. To begin with the stem has 3 incomplete numbers but there are only 2 parts to the question. Part (a) seems incomplete too. 2 odd numbers cannot give a sum which is also an odd number. As for part (b), it can exist on its own. There is no need for the stem as a reference at all. Can only be 13. Best to clarify with the teacher.

Thanks! I have just sent an email to teacher.

Yep. My sense too... may have some mistake or missing information in the question.

P1 ? Are we torturing our kids these days.... ?

Alice Lau same maths questions that Phoebe have..

Oh.. That same math question we crack our heads trying to solve..this is driving us crazy!

Whoa!!!! Whoa!!! Thanks Adrian.... will show it to my boy!!! Tell him this is what we called QUALITY work! 👍

Model drawing

1Triangle+1Heart+1Cylindrical ====$1.50 5x$1.50= $7.50 Extra $0.50-Heart Shape So total sold is-- 5Triangle Shaped-$2.00 6HeartShaped--$3.00 5CylindricalShaped-$3.00 Total--16boxes-$8.00

By trial n error method.

Thanks you

Caleb Tey method correct but use 44 instead of the correct 42 in calculation.

Thank you

Opps. My answer was different so thought wrong method.